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SSS 2008-03-14

时间:2010-05-13 03:26来源:互联网 提供网友:0922013129   字体: [ ]
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    (单词翻译:双击或拖选)

This is Scientific American’s 60-Second Science. I’m Karen Hopkin. This will just take a minute.

If you’ve ever been to the everglades or tuned1 into the animal planet, you know that gators can move through the water oh, so silently barely creating a ripple2. It almost looks like they surface and sink,twist and turn without so much as moving a muscle. Well, it turns out they are moving some muscles, just ones you can't see. According to a study from the University of Utah, American alligators4 navigate5 gracefully6 through the murky7 water by shifting the location of their lungs. You see the lungs act like internal flotation devices and using a set of four muscles including the alligator3 equivalent of our diaphragm, a gator can basically steer8 just by moving those floats around. When they want to surface, they shift their lungs forward, to dive they push them back. And to row off in another direction they just shift those babies to one side or the other. The findings will appear in the April issue of the journal Experimental Biology. This ability to slice silently through the water without actually having to swim, no doubt hopes alligators sneak9 up on unsuspecting prey10. Whoever knew it hit them and so will never have a chance to say" See you later, alligator, after a while, crocodile."

 

Thanks for the minute, for Scientific American’s 60-Second Science, I’m Karen Hopkin .

 


点击收听单词发音收听单词发音  

1 tuned b40b43fd5af2db4fbfeb4e83856e4876     
adj.调谐的,已调谐的v.调音( tune的过去式和过去分词 );调整;(给收音机、电视等)调谐;使协调
参考例句:
  • The resort is tuned in to the tastes of young and old alike. 这个度假胜地适合各种口味,老少皆宜。
  • The instruments should be tuned up before each performance. 每次演出开始前都应将乐器调好音。 来自《简明英汉词典》
2 ripple isLyh     
n.涟波,涟漪,波纹,粗钢梳;vt.使...起涟漪,使起波纹; vi.呈波浪状,起伏前进
参考例句:
  • The pebble made a ripple on the surface of the lake.石子在湖面上激起一个涟漪。
  • The small ripple split upon the beach.小小的涟漪卷来,碎在沙滩上。
3 alligator XVgza     
n.短吻鳄(一种鳄鱼)
参考例句:
  • She wandered off to play with her toy alligator.她开始玩鳄鱼玩具。
  • Alligator skin is five times more costlier than leather.鳄鱼皮比通常的皮革要贵5倍。
4 alligators 0e8c11e4696c96583339d73b3f2d8a10     
n.短吻鳄( alligator的名词复数 )
参考例句:
  • Two alligators rest their snouts on the water's surface. 两只鳄鱼的大嘴栖息在水面上。 来自辞典例句
  • In the movement of logs by water the lumber industry was greatly helped by alligators. 木材工业过去在水上运输木料时所十分倚重的就是鳄鱼。 来自辞典例句
5 navigate 4Gyxu     
v.航行,飞行;导航,领航
参考例句:
  • He was the first man to navigate the Atlantic by air.他是第一个飞越大西洋的人。
  • Such boats can navigate on the Nile.这种船可以在尼罗河上航行。
6 gracefully KfYxd     
ad.大大方方地;优美地
参考例句:
  • She sank gracefully down onto a cushion at his feet. 她优雅地坐到他脚旁的垫子上。
  • The new coats blouse gracefully above the hip line. 新外套在臀围线上优美地打着褶皱。
7 murky J1GyJ     
adj.黑暗的,朦胧的;adv.阴暗地,混浊地;n.阴暗;昏暗
参考例句:
  • She threw it into the river's murky depths.她把它扔进了混浊的河水深处。
  • She had a decidedly murky past.她的历史背景令人捉摸不透。
8 steer 5u5w3     
vt.驾驶,为…操舵;引导;vi.驾驶
参考例句:
  • If you push the car, I'll steer it.如果你来推车,我就来驾车。
  • It's no use trying to steer the boy into a course of action that suits you.想说服这孩子按你的方式行事是徒劳的。
9 sneak vr2yk     
vt.潜行(隐藏,填石缝);偷偷摸摸做;n.潜行;adj.暗中进行
参考例句:
  • He raised his spear and sneak forward.他提起长矛悄悄地前进。
  • I saw him sneak away from us.我看见他悄悄地从我们身边走开。
10 prey g1czH     
n.被掠食者,牺牲者,掠食;v.捕食,掠夺,折磨
参考例句:
  • Stronger animals prey on weaker ones.弱肉强食。
  • The lion was hunting for its prey.狮子在寻找猎物。
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TAG标签:   SSS  alligator
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