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美国科学60秒 SSS 2012-10-05

时间:2013-06-19 08:12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)

 A rabbit might outrun a fox, but stalks of wheat aren’t making any quick getaways. Plants, for the most part, don’t flee from predators2.

 
But some primitive3 marine4 plants are breaking the rules. Marine scientists at the University of Rhode Island School of Oceanography recently discovered a species of phytoplankton that actively5 avoids being eaten.
 
The scientists observed that the phytoplankton, called Heterosigma akashiwo, swam away from zooplankton, its natural predator1, yet remained undaunted by the presence of predators with an appetite for other things.
 
What’s more, when the scientists provided an area that the predators couldn’t tolerate, sort of a safe haven6 if you will, the phytoplankton took refuge in that location. They also avoided empty water that had previously7 contained predators, leading researchers to believe they’re responding to some sort of chemical signal. The discovery is published in the journal PLoS ONE. 
 
It was already known that phytoplankton could move toward light and food, but this is the first time they’ve been known literally8 to go out of their way to avoid being a meal themselves.

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1 predator 11vza     
n.捕食其它动物的动物;捕食者
参考例句:
  • The final part of this chapter was devoted to a brief summary of predator species.本章最后部分简要总结了食肉动物。
  • Komodo dragon is the largest living lizard and a fearsome predator.科摩多龙是目前存在的最大蜥蜴,它是一种令人恐惧的捕食性动物。
2 predators 48b965855934a5395e409c1112d94f63     
n.食肉动物( predator的名词复数 );奴役他人者(尤指在财务或性关系方面)
参考例句:
  • birds and their earthbound predators 鸟和地面上捕食它们的动物
  • The eyes of predators are highly sensitive to the slightest movement. 捕食性动物的眼睛能感觉到最细小的动静。 来自《简明英汉词典》
3 primitive vSwz0     
adj.原始的;简单的;n.原(始)人,原始事物
参考例句:
  • It is a primitive instinct to flee a place of danger.逃离危险的地方是一种原始本能。
  • His book describes the march of the civilization of a primitive society.他的著作描述了一个原始社会的开化过程。
4 marine 77Izo     
adj.海的;海生的;航海的;海事的;n.水兵
参考例句:
  • Marine creatures are those which live in the sea. 海洋生物是生存在海里的生物。
  • When the war broke out,he volunteered for the Marine Corps.战争爆发时,他自愿参加了海军陆战队。
5 actively lzezni     
adv.积极地,勤奋地
参考例句:
  • During this period all the students were actively participating.在这节课中所有的学生都积极参加。
  • We are actively intervening to settle a quarrel.我们正在积极调解争执。
6 haven 8dhzp     
n.安全的地方,避难所,庇护所
参考例句:
  • It's a real haven at the end of a busy working day.忙碌了一整天后,这真是一个安乐窝。
  • The school library is a little haven of peace and quiet.学校的图书馆是一个和平且安静的小避风港。
7 previously bkzzzC     
adv.以前,先前(地)
参考例句:
  • The bicycle tyre blew out at a previously damaged point.自行车胎在以前损坏过的地方又爆开了。
  • Let me digress for a moment and explain what had happened previously.让我岔开一会儿,解释原先发生了什么。
8 literally 28Wzv     
adv.照字面意义,逐字地;确实
参考例句:
  • He translated the passage literally.他逐字逐句地翻译这段文字。
  • Sometimes she would not sit down till she was literally faint.有时候,她不走到真正要昏厥了,决不肯坐下来。
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TAG标签:   美国60秒科学  SSS  英语听力
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