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SSS 2012-01-18

时间:2012-02-17 05:54来源:互联网 提供网友:gmeng   字体: [ ]
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    (单词翻译:双击或拖选)

 True to their names, boa constrictors squeeze the life out of their prey1. But how dose a boa know it’s enough for a rat? The snake listens, for a heart beat. When it stops, that’s a cue to let go, according to a study in the Journal biology letters. Researchers outfitted2 with artificial beating hearts. They used dead rats to control for other signs of , like muscle. Then they warmed up the rats, set the hearts pumping and dangled3 them in front of hungry Boas. The sankes attacked, and as long as that rat heart pumping, the boas kept tightening4 their coils and p of pressure, sometimes for more than 20 minutes. But as soon as the scientists kill the heart beat, the boas loosened up. Even captive boas, who had never hunted a live prey paid attention to the pulse, suggesting the behavior is innate5 and for good reason. The authors say constricion takes a lot of energy, and it can be dangerous, say, if an enemy strikes while the snake’s coiled around its  . But by following heart, boas can keep the pressure on just long enough before a relaxing meal.


点击收听单词发音收听单词发音  

1 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。
2 outfitted a17c5c96672d65d85119ded77f503676     
v.装备,配置设备,供给服装( outfit的过去式和过去分词 )
参考例句:
  • They outfitted for the long journey. 他们为远途旅行准备装束。 来自《现代英汉综合大词典》
  • They outfitted him with artificial legs. 他们为他安了假腿。 来自辞典例句
3 dangled 52e4f94459442522b9888158698b7623     
悬吊着( dangle的过去式和过去分词 ); 摆动不定; 用某事物诱惑…; 吊胃口
参考例句:
  • Gold charms dangled from her bracelet. 她的手镯上挂着许多金饰物。
  • It's the biggest financial incentive ever dangled before British footballers. 这是历来对英国足球运动员的最大经济诱惑。
4 tightening 19aa014b47fbdfbc013e5abf18b64642     
上紧,固定,紧密
参考例句:
  • Make sure the washer is firmly seated before tightening the pipe. 旋紧水管之前,检查一下洗衣机是否已牢牢地固定在底座上了。
  • It needs tightening up a little. 它还需要再收紧些。
5 innate xbxzC     
adj.天生的,固有的,天赋的
参考例句:
  • You obviously have an innate talent for music.你显然有天生的音乐才能。
  • Correct ideas are not innate in the mind.人的正确思想不是自己头脑中固有的。
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