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5.11 alternative fule A-21

Since we've been discussing alternative fuels lately,  [news:/s/00:07.4-00:11.2] "xsPU,L
I wanted to pass on to you some information I read about a new fuel that's been in the news a lot lately. *U;y k(K9Co3@:`:q,D{
[news:/s/00:11.2-00:16.9]
EE
I!Py+J}#O
It's called A-21. [)Y+E#@@sB i
It's composed of water and a chemical [b]known as naphtha[/b]. [news:/s/00:19.3-00:22.7]
0lo;?BF#U It seems to be a very promising fuel  [news:/s/00:22.7-00:24.9]
xc,k}Sln/e7U/fF0eX because it's much cleaner than the [b]gasoline[/b] that we use today. [news:/s/00:24.9-00:28.1]
D1ML(d B That's not to say that it doesn't pollute, but it is cleaner. [news:/s/00:28.1-00:32.3] 1~;kwm|4F}
A-21 isn't like some other alternative fuels that require completely new types of [b]engines[/b]. [news:/s/00:32.3-00:38.0]
6|'O*wz.d/A A-21 still works in regular, everyday [b]combustion[/b] engines  [news:/s/00:38.0-00:42.4]
e:R5j%R Er#tE --- like the ones in cars n,V n-`2Ocen3]
--- with only minor [b]mechanical modifications[/b]. [news:/s/00:42.4-00:46.6]
3K'[$i.q~w So changing over wouldn't be a big deal.
#]:s:l]+R [V-F kQ You may doubt some of these claims as many researchers have [news:/s/00:49.0-00:52.6] hfGybO)x:GD8B"AY
Some people [b]feared[/b] that because it contains about 45 percent water it would freeze in the [b]winter[/b].
yJ*C}!W.h/C [news:/s/00:52.6-00:58.4] #w&n!b,CH*vF
~
But a small amount of [b]antifreeze[/b] was added to it, and that seems to have [b]solved[/b] the problem.  [news:/s/00:58.4-01:03.3]
Qy q1U#Xc(K} A-21 has recently [b]undergone[/b] street tests in buses in Reno, Nevada. [news:/s/01:03.3-01:08.3] ;Z"j9Jj-k W6L&l
So far it seems to work just fine. [news:/s/01:08.3-01:10.6]  This is a good thing, especially in Nevada, [news:/s/01:10.6-01:12.5]  7u$q-vt1k-YPa
because the state government there has passed a law requiring that a large percentage of vehicles in Nevada run on alternative fuels. [news:/s/01:12.5-01:20.0]
)@qD\ZB:}M4SG A-21 should help.  [news:/s/01:20.0-01:21.8]

#28

5.11 gas hydrate
IC/D fj'e"b m{*I about science#D-nV^:\1p)oBJ(k
scientists are always on the lookout for the [b]alternative[/b] source of energy. [news:/s/00:09.4-00:14.0]
.aP6OC#RII today we were going to discuss one that's so plentful, they say it could supply more energy than all the coal and oil in the world. [news:/s/00:14.0-00:22.1] }V:F#Ky?}/M
it's found in something called gas [b]hydrate[/b] [news:/s/00:22.1-00:24.8] .and believe it or not ,that's a kind of ice. [news:/s/00:24.8-00:27.9]
5bV4U+|tD that's right.but the water in this ice was way down below the earch surface when it was frozen O-Ga\yn/i
  [news:/s/00:27.9-00:33.8] e.XE5DQt.S
so it was under a lot of pressure [news:/s/00:33.8-00:36.4] ,
`(s;}7~6m and [b]traped[/b] inside the [b]crystals[/b] of ice are individual [b]molecules[/b] of [b]methane[/b]  [news:/s/00:36.4-00:41.6] [url=news:/s/]news:/s/[/url][kN6Q.qH
5BjZ9w)l4}
that's what's in natural gas. [news:/s/00:41.6-00:43.7]
+A:q7dU$|i all these make gas hydrate pretty strange stuff. [news:/s/00:43.7-00:47.3]
1dI2[ Fd,C if u touch a [b]match[/b] to a piece of this ice, it ? burst in the flame. [news:/s/00:47.3-00:51.7] #Y]"BR!X4|Q(O5_gk
and when geologist bring a [b]truck[/b] of it up to the surface to study at normal air pre and temp. (v:oT Y1QT P
[news:/s/00:51.7-00:57.9] #UGk&C)b4[%LX0ZDrg
gas hydry begin to [b]hiss in bubble[/b] [news:/s/00:57.9-01:00.5] ,&Q0Zq&@_}P0|auVL
and[b] in less than half an hour[/b], the ice melts and methane inside escape into the air. [news:/s/01:00.5-01:06.3] &bBARBa
Yj
now as you might guess, this can make gas hydrate kind of hard for [b]miners[/b] to handle. [news:/s/01:06.3-01:12.3] `7]'oj`V)y9V4QA6K F
and the there's the problem of where it located, *th#I _w a-S
in frozen [b]arctic regions or in ocean waters off the atlantic coast[/b] [news:/s/01:15.3-01:19.8] ,and up to a mile down,.

hc;ln9F,R5Z [b]environmentalists[/b] [b]warn[/b] that mining could even be [b]disastrous[/b] [news:/s/01:22.1-01:25.9] ,K:i*{+F'D8aG
[b]offshore driffing[/b] could allow  sea water to [b]seep[/b] down into the huge ice [b]deposits[/b]  [news:/s/01:25.9-01:34.6] and release tons of methane up into air atmosphere.
_6{A$Yc!A and methane ,our listener may recall ,is a green hourse gas [news:/s/01:34.6-01:39.3] ,
0J)e
Bq6E/VL+v
h!q"e it can really worsen the problem of gloabl warmming  [news:/s/01:39.3-01:42.1] [url=news:/s/]news:/s/[/url].
OI)n lK so gas hydrate may offer some interesting [b]possiblities[/b], [news:/s/01:42.1-01:46.5] $j N~Qc E;A7@r+c*W
but with all these drawbacks i am not going [b]to hold my breath[/b] waiting for it to  fule my [b]furnace[/b].
"e v(j&w e7E#M5G [news:/s/01:46.5-01:53.2]
xG&UnL2@d
F:|p'{HZiJ [[i] 本帖最后由 pulse 于 2008-5-16 11:07 编辑 [/i]]

楼主你要加油呀，坚持就是胜利！！:lol :lol

写得不错，鼓励一下

#29

512 migration
%{Ao Gy M ;C-G'y!Ao_,Y4f ]&R2V
As Dr. Miller mentioned, we're[u] [color=blue]trying to[/color][/u] [b]recruit volunteers[/b] for the Hawk Mountain Sanctuary
-z\P+nxC1p[lizq6K [news:/s/00:07.0-00:13.2] W9^'? a-rN^z
but before i get into the detail of the volunteer program [news:/s/00:12.9-00:16.8] ,
~wh0S+JU e#Xbj i'd just like to tell u a little about what we do there  [news:/s/00:16.8-00:19.8] Mvv:\X0{/~9@`T#\
one of our main job isaZ)E3dj7Q
to keep [b]detail records of migration patterns of raptors[/b].  [news:/s/00:21.5-00:25.3]
r7u rOP^[ For those [color=blue]of you[/color]  who  don't  know [news:/s/00:25.3-00:26.8] ,   L'Zt
Q e
raptors  are  birds [b]of  prey[/b],  like  hawks  and  eagles.  [news:/s/00:26.8-00:30.5] xXNpf,s
Q2B;Km6v$b~ i1Fc
between august and december [news:/s/00:30.5-00:32.6] F&]-S$N| O {G
,we see around 20 diff species [b]migrating[/b] from canada and england ,about 20,000 birds.Aj~Qli8x!h
[news:/s/00:32.6-00:39.4]
K8t$s2n/`,L%ZAi(iX6A [b]Part of what attracts[/b] them to Hawk Mountain  [news:/s/00:39.4-00:41.8]
R7p`:ayS]Y/t
is the location on the east [b]ridge[/b] of the Appalachian Mountains    [news:/s/00:41.8-00:45.8]
\kz-tZ$C)a|2l$w what happens is that the sun warms this ridge in such a way  [news:/s/00:45.8-00:49.6] +Ew;w0I"e
that [b]air currents[/b] are formed.  [news:/s/00:49.6-00:51.4] 4^*tfv2P{
Hwv
the birds just [b][color=blue]sort of[/color][/b] [b]glide[/b] along on the air [news:/s/00:51.4-00:54.9] so they use up very little energy [news:/s/00:54.9-00:57.1]
!O4Jz&lYC^/?W As volunteers [news:/s/00:57.1-00:58.7] , you'll be helping us keep accurate [b]counts[/b] of the raptors.  [news:/s/00:58.7-01:01.4] &|Yf V*D
A
1Q*l f9_v [nl P
any drop in number could means some thing gone worng in the enviroment. [news:/s/01:01.4-01:05.8]
)k
X G.p)M1vNI because of [b]pesticides[/b] or disease ,ever hunting.   [news:/s/01:05.4-01:08.9]
r0B:Kg7a~9D@ We just had a [b]scare[/b] with the [i]broad-winged hawks[/i], [news:/s/01:08.9-01:12.1] $u;k:n"g"w @
Their numbers have dropped drastically over the last ten years  [news:/s/01:12.1-01:16.1] X9oB#Ta3d,oYS
would suggest the birds may have change their  [b]migratory route[/b]  [news:/s/01:16.1-01:20.1]
%{;VzA[a So for 11days we had several hundred volunteers --- [b]stationed[/b] every five miles --- to observe and count.  [news:/s/01:20.1-01:26.9]
!uiv s7bS
i,T And sure enough, they discovered that instead of [b]hugging the Appalachians[/b] as they'd always done,
Q2avH:|*^+a6U0mO the  broad-wings  were  cutting  a  wide  path  over  the  Delaware  River.  [news:/s/01:26.9-01:36.5]
Bx,MPU C^H+L Needless to say,  we were greatly [b]relieved[/b].  [news:/s/01:36.5-01:40.6]
.j0G zj2@P S7g.eo_G*z
[[i] 本帖最后由 pulse 于 2008-5-16 11:08 编辑 [/i]]

#30

5.12 colorful frogs
:|8M%} uM1hQ7p R
t )J-R2Zq;X(q;R
guide in zoo
3Qx(E_z3Z$Nh"WAv if you like the color[b][color=blue]ful[/color][/b] [color=dimgray](of)[/color] animal we just saw, you're going to love these next animal.frogs.
9H+h-l Q'Y [news:/s/00:06.0-00:13.1]
e:H.s z4~$i*tDp#K you might not normally think frogs [color=blue][b]as [/b][/color]being colorful, [news:/s/00:13.1-00:16.7] AK|/ND!toO;p.o9pK
these frogs [b][color=blue]definitely[/color][/b] are. [news:/s/00:16.7-00:18.6]
U1`c,{T5KO&R they are the [b][color=blue]dart[/color][/b]-poision frogs of central and souch america. [news:/s/00:18.6-00:23.1] yNm%ms|
look at their [b]striking[/b] color [news:/s/00:23.1-00:25.3] , ofter yellow with [b]balck stripes[/b], or deep blue with [b]black spots[/b] [news:/s/00:25.3-00:29.7] %S^`g$P+|?
[color=red][b]beyond[/b][/color] being nice to look at, [news:/s/00:29.7-00:32.2]  these markings have a porpuse. [news:/s/00:32.2-00:34.0] 'V^z\ d u1R I;j-~-Y k
they warn [b]predators[/b] that these frogs are poisonous.  [news:/s/00:34.0-00:37.5] &f#Gs Cc
L"t*}
[b][color=red]when threaten[/color][/b], these frogs [b]secrete[/b] a substance through their skin that would easily kill whatever animal might try to eat them. [news:/s/00:37.5-00:43.9] ,mcd/CmH;`rQ
their bright colors communicate this. [news:/s/00:43.9-00:46.2] and so most animal tend not to [b]hunt[/b] them [news:/s/00:46.2-00:49.1]
c:_g.jpU,v%F#X*q now sperking of hunting, for centuries these frogs were sought [b]after[/b] by hunters. [news:/s/00:49.1-00:54.7] 'Zo+j(Q'Yfmp
as you might think the hunters didnt want to eat the frogs [news:/s/00:54.7-00:57.9] ,a+_8H
Sv`"kDB}
[b]rather capture[/b] them for their poison. [news:/s/00:57.9-01:00.7]
:t'wJ!M#o;}x`rw,q they will add the poison to the [b]tips[/b] of huntering area.  [news:/s/01:00.7-01:03.8] -]"K,Y1Z@eE2D-fI/}
of coures nowadays most hunters use guns. [news:/s/01:03.8-01:06.6] 4P8~6b,z^ P
these days dart posion frogs are of[b] less interest to hunter than to medical researchers[/b]. [news:/s/01:06.6-01:12.6]
Ejl
Z&Y5p?-RO researcher believe that they can make new [b]heart[/b] medicine from the poision [news:/s/01:12.6-01:16.4]
)bx5g_1h4]#[&}?5B because it acts as a [b]stimulant[/b] on the body's nerver system. [news:/s/01:16.4-01:19.7]
B B^` _P researcher think that they can use it to [b]stimulate[/b] [b][color=blue]weak heart[/color][/b]. [news:/s/01:19.7-01:23.3] sp8D*G3n'CTz^
There is, however, a problem with doing research on these frogs. S"yY0z)Wfh\f
Those that are caught in the wild will produce their poison until they  die. However, those that  are born in [b]captivity[/b], like the ones you see here, will not produce any poison at all.
R8D"w-l2KqU'n4B,lT bB}*[~3N
[[i] 本帖最后由 pulse 于 2008-5-16 11:09 编辑 [/i]]

或许 我能做的只是尽量把听过的词听出来r@ BF [M*d
有点难。。。为什么还是那样，一句话第一次听总是很难听出来

记住生词
/J|3\S3Pu 纠正熟词

1）
Kt6p#YXzEo sort of  
qoZ4I?"M%ZM*Sbx5h those of you who don't know
l*~%R2m m] 2kw:]pG
lJ$LV
2) K|7j5O{.D-`8qI
we're
l$a8QC{9S\ i'd
Pc-@lCo one of our main job

坚持住哦~~~~:victory:

#30

listen to a guide talking to a zoology class on bus tour at zoo. |1U eX j dE

B*dN8g3w now we're [b][color=blue]entering[/color][/b]  kangraroo country.   [news:/s/00:09.1-00:11.8] A#DXU9V#o

}/VVUY8z in all, there are more than 15 different species of kangraroo. [news:/s/00:11.8-00:15.5] gqc&r5?J(g

~{
w9nV&p'AE the advantage of the zoos like ours is that you see them in their natural [b][color=blue]habitat[/color][/b]. [news:/s/00:15.5-00:20.0] "{nR/P
u y8o!m%P
3N{w]&g+u?g)b[1mj
the ones we have all live in the [b]grasslands[/b].  [news:/s/00:20.0-00:22.9] 7Xt,S5V_.m&@9u5A"U
O jH ]BJ1WL
[b][u]on my right[/u][/b] you can see [u][b]one of[/b][/u] the bigest types ,the red kangraroo. [news:/s/00:22.9-00:26.9]
_7u)KvB(q:C`$p'UI G]0v'A.C(h
it travels about 20 m/h. [news:/s/00:26.9-00:29.1] p4Z7whiE w
tj#Db1vj9R
I
it looks like hard work.  [news:/s/00:29.1-00:30.6]
\*vr8m`#V;R&J I._i1N
Wu
w+J ?'P
but [b]hopping[/b] actualy lets the kangraroo [b][color=darkred]conserve[/color][/b]  more energy than another animal could.when running [b]on 4 legs[/b].  [news:/s/00:30.6-00:36.5]
3y'R)X'Z [`B
tlfbe8`4XkUk*JjM in fact, up to a certain point, the faster the k goes, the more energy it conserve . [news:/s/00:36.5-00:42.7] e4V i&^b;P9{

#K.?V%va^D rather than taking more hops to increase speed [news:/s/00:42.7-00:45.8] ,

jz bMKs%y.|#|'t*F-q *p3MxU'^?
the k make the [b][color=blue]length[/color] [/b]of each [b][color=blue]jump[/color][/b] longer  [news:/s/00:45.8-00:49.2] Ez!\Z,g
HEVaBx'\L
let's stop here for a minuter  [news:/s/00:49.2-00:51.0] a0@HO{g

o;eF*a Y2C6YFr S3avD .take a look over [b]on your right[/b] this group of garr resting  [news:/s/00:51.0-00:55.0] l%bHu6t't

{x7Kj9O{x can u see their [b]ear[/b] are moving,  [news:/s/00:55.0-01:00.9]
.j&PpYfg_"x
2@2@8X:O'rR(Z)gc4c [b]hearing[/b] may will be k's  most important sense  [news:/s/00:56.8-01:00.9] )cB'Fwx(y2GV h

(i|wgo\;J(^ their 2 large ears can move independently, so sometimes one ear is [b]pointing[/b]  forwards ,and the other towards rear. O'_7F{0X"V1x6T
_{;Iq
m~,XE%Qk
[news:/s/01:00.9-01:07.5] dm$iCD-Y

_]R?;bNi k's eyesight is also excellent,  [news:/s/01:07.5-01:10.5]
Z5tA)c[8R;_K4{ 5 13 H2\9olA;@QX
they have wide [b]field of vision[/b] and like most [b]grazing[/b] animals, they are specially good at detecting movement.
._C)O\P\ [news:/s/01:10.5-01:17.9]
jN"W'I$P/rR
Dqm;]O before we move out, i want to point out one more thing. [news:/s/01:17.9-01:20.8]
(ayj7b6un Qyk -I ljYp^.[]
if u looks closely, u can see a [b]joey[/b].  [news:/s/01:20.8-01:23.7] 9B1ts(w&W1V

9yEWQ+i that's a baby kangaroo --- peering out  of its mother's [b]pouch[/b].  [news:/s/01:23.7-01:28.1] *\/rJ-kX
S
M6W2b4\
4O^4lF"aS#?u ^3z
Before long that joey will be out  of  the pouch for good.   [news:/s/01:27.7-01:31.1] news:/s/9_9XS9stX

(n_0Y@U;Wp The mother will push it out by the time it's eight months old.  [news:/s/01:31.1-01:36.8]
Y;M;q){1ADj!rNP
?
1A e3JA(mo5HQNp [[i] 本帖最后由 pulse 于 2008-5-16 11:10 编辑 [/i]]

#31

515
`.m+p!j\(a.L 1|^4L9O-QMm.e
animal behavir p0[` J G^"k
as a way of [b]illustrating[/b] our discussion of group behavir of animals  [news:/s/00:05.9-00:10.4] ^]&pd^*Rbn
Qe
we're going to watch what i think is [b]fascinating[/b] video tape about the eland. [news:/s/00:10.4-00:15.4] Je!g,\%`q*b
one of 2 major species of [b]antelopes[/b] in africa  [news:/s/00:15.4-00:19.0]                      [news:/s/00:05.9-00:19.0]
#URGsU9I&m"W1I they lived in herd about 200 individuals. [news:/s/00:19.0-00:21.9]
4gcOz6s)P6W but first let's go over some of the [b]general[/b] advangtages  animal get from group association    [news:/s/00:21.9-00:28.3] q&?gJF
[news:/s/00:19.0-00:28.3]
wq'U,G'zg-J?
(il/z1NU propbaly the most important  adva is [b]defence[/b] agaist predators   [news:/s/00:28.3-00:33.3] O"Y.A0j'qU
ZnY)z\(U
simply being in a large group, decrease the chances of any individual will be the [b]victim[/b] of predators.
Iy3U5DA4tKFT%r [news:/s/00:33.3-00:39.8]
D$})d'R8S [b]cooperated[/b] [b]defence[/b] further increase the chances of [b]survivor[/b] for the individual and species. [news:/s/00:39.8-00:46.8]
]9Z1l|| Q{ `'G
zO w+K.cx7M
C you see in the video that when herds [u][i]detected /are attacked?[/i][/u] by hyenas , [news:/s/00:46.8-00:50.8]
0Q"~V9r zh the eland [b]deliberately[/b] drive their young into the [b]center[/b] of [b]tightly patched[/b] group,  [news:/s/00:50.8-00:55.9]
_6B-CB9Zwt fFW the center being safer than the [b]periphery[/b]  [news:/s/00:55.9-00:58.7] ,I@$H:t8W n `!q
[news:/s/00:46.8-00:58.7]
+ZdTu7V;e the herd [b]act[color=red]s[/color][/b] in a way that increase the chance of per? survior of offsprings.  [news:/s/00:58.7-01:03.7] &cOB5t!jMd ?"v
cooperated defence may even take the form of [b]offence[/b]   [news:/s/01:03.7-01:07.4] wj$e:O)l
many species of small birds will join tog in group to attack predators like owls and hawks  [news:/s/01:07.4-01:14.4] )B)pV bVmv
another advange to live in group is the [b]commonsense[/b] [b]notions[/b] that many eyes is better than the single [b]pair[/b]   [news:/s/01:14.4-01:21.3]
D8A R(W`B(F@"K it has been demonstrated that a large herd detect predator at greater distance than do individual. [news:/s/01:21.3-01:27.7] }{!B1`D
of course there is a [b]down side[/b] to living in group also. [news:/s/01:27.7-01:34.8]
/Te&XXZ)t2l but lets watch the video before we get into that.r4DrndP/Mk

Vp7VD!l8h&\C q [[i] 本帖最后由 pulse 于 2008-5-16 11:11 编辑 [/i]]

#32

5 15+Y#spr6\i0s#P6t
as you all know, Dor Nelson's assignment is for each [color=blue][b]of us[/b][/color] to find a liitle [b]scientific[/b] [b]puzzle[/b] to reseach and [b]solve[/b].
0s7A5a#y3j
jz [news:/s/00:05.5-00:13.7]
H!?-]#L2i#d|5E8P1f6V well, mine was ,why donot spiders get [b]stuck[/b] in their own webs? [news:/s/00:13.7-00:19.1] zrL'C;M5n4E
pretty good question if u ask me [news:/s/00:19.1-00:21.7] ``Ra/o6AEM
someone even read a [b]thesis[/b] on it i'm sure. [news:/s/00:21.7-00:24.6] u)f|z4^X.j6sg
there are actually several answer depending on the spider. [news:/s/00:24.6-00:28.2] 2Z*uZ5U;R%G
let's star with one common type of spider. [news:/s/00:28.2-00:31.4]
Q0m-awK)Y {A this spider usualy [b]stay in the middle of[/b] their webs,  [news:/s/00:31.4-00:34.9] ,x"|
p6|0V.y,yg
and donot [b]put[/b] any [b]glue like material[/b] there. [news:/s/00:34.7-00:37.8]
Dc0LE.F,{ they do [b]leave a thin strand of sticky [/b]material on the outer parts of the web. [news:/s/00:37.8-00:42.6]
%A9x^0B:|T z O0jK this material is made of compouds that [b]draw water molecules  out of the air[/b]  [news:/s/00:42.6-00:48.0] zwqR{Mzg#J
if it [b]draws enough water[/b] it dose what water normally does  [news:/s/00:48.0-00:53.6] 5SCD:rA2bD
it[b] forms little drop[/b]  [news:/s/00:51.6-00:53.6]
:e)y/i9g)K$Ws^ the result is  [b]sticky little globs[/b] ,[b]little balls[/b] of glue like material. [news:/s/00:53.6-00:58.7] %?#G.]-e6n
when a spider steps into one of these little [b]globs[/b] by accident as it sometime does. [news:/s/00:58.7-01:03.8]
l(u,E)pqc
Z"[ [i][u]it's if[/u][/i] human being step on a piece of chewing gun  [news:/s/01:03.8-01:07.4]
Dg$}N!k u/f+T it just inconvients   [news:/s/01:07.4-01:09.4]
uy}3~&yA @)ZBN(q4A;b o[1e*Zs
but when a fly flies into the spider's web, it hits about 50 of [b]globs[/b] enough to make[b] sticky tightly[/b] to the web
6n!I(Wo{'c-~:b,x [news:/s/01:09.2-01:18.0]
,V?,YpVJ_/s
Yq9_k what's more,  because the [b]sticky[/b] material is in the glob instead of in the [b]uniform[/b] coat, the spider uses less of it. By doing this, the spider saves energy and that means it has to catch fewer flies.
{+Z+d4[!]9l)Xz qX @ P
Gge
It is not of [b]economy[/b] really. The spiders do what is easiest for spiders
lO;xD6}9tB *a!G`N%uy3H9_9o
[[i] 本帖最后由 pulse 于 2008-5-16 11:12 编辑 [/i]]

一起加油啊，pulse,能告诉一下你的msn吗

[email]caifahui@hotmail.com[/email]    希望能和你一起进步，交个朋友

#33 5 16

i finish up our unit of [b]arachinds[/b] by looking  at what may seems a very unusaual aspect of spider.behavir  `C1zhq
[news:/s/00:10.3-00:18.0] Sf/J+sjP$C)uewgV
a speices where the young spider actuall [b]consume[/b] the body of their mother. [news:/s/00:18.0-00:23.2] r(}A^!zq!X
unlike most othre spider, this species lays one and only one [b]clutch[/b] of 40 eggs in lifetime  [news:/s/00:23.2-00:31.6] `d$S)qx7E
the young spider [b]hatch[/b] in mid-spring and early summer  [news:/s/00:31.6-00:36.3]
iU/kA:S.~p inside of nests  of [u][i]eculpus[/i][/u] lives [news:/s/00:36.3-00:39.0] 3~p?4t2Cv
their mother spends the warm summer [b]months bringing[/b] home large insects. [news:/s/00:39.0-00:43.5] L3`6~)~Rm%I
often 10 times her [b]weight[/b] for meals. [news:/s/00:43.5-00:47.3] 0i6aoc,k#N6|D
the [b]catch[/b] is always signfi more than her young spider can eat  [news:/s/00:47.3-00:52.0]
0O"u)[dZv$]rU so the mother [b]fatten[/b] herself up on this [b]extra prey[/b] [news:/s/00:52.0-00:55.9]
jE k`Lp ` . and store the [b]nutrients[/b] in her extra unfertilized eggs.  [news:/s/00:55.9-01:00.4] [url=news:/s/]news:/s/[/url]ja8l"vOp;R`
as the weather turns cold, there are few insect prey to hunt.  [news:/s/01:00.4-01:04.7]
1u,D/VX^rS_.? that's when the nutrients stored in those extra eggs begin to [b]seep[/b] into their mother [b]bloodstream[/b] [news:/s/01:04.7-01:12.3] q+k(^%t0H;CB
so when there is no more insects to feed to young spiders,they attach themself to their mother's [b]leg[/b] [b]joints[/b]
z)~K4G"u.|bg [news:/s/01:12.3-01:20.8] ;u%CfE]IYpyN
and [b]draw nourishment[/b] by [b]sucking[/b] the [b]nutrient-rich[/b] blood. [news:/s/01:20.2-01:25.0]
1~
e0m_f8u;S'G'L after sev weeks , the mother was [b]depleted[/b] of all [b]nutrients[/b] and she dies. [news:/s/01:25.0-01:30.6]
} gJ@b8f}#t9l but then how did the young get [b]norishment[/b]? they start to feed on one another. [news:/s/01:30.6-01:38.1] nHv%~9|t~p
now if you recall the diss of Darwin, you see the evoluationay value of this [news:/s/01:38.1-01:43.8]
pg OlW\#e only the strongest spider of cluth survial  this caninlism  [news:/s/01:43.8-01:49.2] (p(h2e$WRP!e'h2o[(r
and the mother spider will have [b]ensure[/b] that her [b]gene[/b]  have increase chance of  surivial through future generation.]Q"q.Cz)M7i@
[news:/s/01:49.2-01:57.4]
)tx$A2ja(b5d4Q1l+i%~ -----
C RJ0vP"H nourishment,e5BW C0t#~.~
nutrients5VF h&\
xr:}c2}6L.SJj
nutrition4m0_~6|)M.mhE
pGgF,_Ob0I
[[i] 本帖最后由 pulse 于 2008-5-16 11:13 编辑 [/i]]

#34 5 16

2 students who study for zoology examine
i8tx(t.z F?-CM now let's see, prof stone spend lots of time talking about how animal walking and running
){d8?pEzF3G l#K9J and i rember she start by descriping how human move  [news:/s/00:14.9-00:22.5]
a-o,d5{ { s&s7v(A and later we went over the gaits of  difference of 2 legs and 4 legs animal,like cats,camel,lizard
Cc)M&h2K{ [news:/s/00:06.4-00:22.5]
)M;SbcQ%w:{/W wait i think i miss the class when we went over how lizard move/jh'm]/a4b"v6Y.~'F
at least i donot have any notes on it #z,u/Y7D$[lxp8?
[news:/s/00:22.5-00:29.8]
-E{9wpnJ we talked in the class about how modern reptiles like lizards run5Y t-ljk
g Xn'{#l
i think i even copy the diagram of prof drew on the boardCGgX@*kA@#I
here it is  [news:/s/00:29.8-00:38.8] e;x[P,Wwz
now look at this. lizzard's run was  what's called sporing gait ,5raz4oWd7Q.E w7Q
their feet were well out on either side of body.
-y9P4St[%}2H and they moved diagonally opposite feet together
Wh
T]:}ms [news:/s/00:40.5-00:52.0] rDt[ K
the left fore foot with the right hind foot ,and the right fore foot with the left hind foot
e"V,P:MW+L [url=news:/s/]news:/s/[/url] [news:/s/00:52.0-01:58.4]
1zU;}!n&Tg when move,bend their body from side to sideo?2K4T8o.{Jg/T9a
and they time these bending,  so that increase the length of their steps
[4e B`(svG@ [news:/s/01:02.3-01:09.5]
l(c$Icu^(Y9W
4LBt6G/ngCB,d ok that make senses.
T j/Va/U9d2ThOu animal evolves so that their feet were right under their body  [news:/s/01:14.5-01:18.8]  +[Ls {d

umA#VO3^f:S That’s because even the sprawling gaits suits lizards pretty well, there's a major disadvantage 3q ah#y Y:fXi
to this arrangement.  [news:/s/01:20.9-01:28.8]
*}Q*z+^6k Reptiles can’t run and breathe at the same time.  [news:/s/01:28.8-01:32.6]
%|K6e)DXQ o They stop briefly between short breaths of anywhere from 2 to 12 strides because [news:/s/01:32.6-01:38.4]
;M.phG
Y1V)sv)g when they move from side to side, the muscles of the left and right sides contract at different times
#y7SWh#K4MUW_6HW .  [news:/s/01:38.4-01:45.9]
!Q~Ye0K$U!o kT;` to breathe though, these muscles have to contract at the same time. [news:/s/01:45.6-01:50.2] ] f \7h}_%pH.i
  
0miHe-k"EM@8S7H Mammals don’t have this problem  because they don’t move from side to side. Their feet are in the different position. [news:/s/01:49.9-01:57.3]
GK*X#T)Q$b
s`iP X&V6]'f/M [[i] 本帖最后由 pulse 于 2008-5-16 11:13 编辑 [/i]]

[quote]原帖由 [i]麦田稻鹰[/i] 于 2008-5-15 16:37 发表 [url=http://www.xiaoma.com/bbs/redirect.php?goto=findpost&pid=148776&ptid=11866][img]http://www.xiaoma.com/bbs/images/common/back.gif[/img][/url]
4r@!qzn [email=caifahui@hotmail.com]caifahui@hotmail.com[/email]    希望能和你一起进步，交个朋友 [/quote]*Al(Xq0t&Q}
N'E7~2Aw)^ Xt
看LZ的帖子就知道LZ一向是个少言寡语，脚踏实地的人呢~~mV5\q,qL
麦田也来发听写贴吧~大家一起进步，把听写坚持到底~:D

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[quote]原帖由 [i]NEC`[/i] 于 2008-5-17 00:22 发表 [url=http://www.xiaoma.com/bbs/redirect.php?goto=findpost&pid=150215&ptid=11866][img]http://www.xiaoma.com/bbs/images/common/back.gif[/img][/url]
.nOa#fm4Z1a2@L 加你了:kiss: [/quote]o+O}PW8?
r0`hpw'{.@
NEC是PLUSE的马甲？