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SSS 2010-03-03

时间:2010-05-20 03:31来源:互联网 提供网友:mark@li   字体: [ ]
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    (单词翻译:双击或拖选)

Sometimes scientific discoveries are hidden in museum specimen1 drawers and old journal articles. In two studies in the journal Science, researchers who went through the stuff in institutional attics2 offer new insights into the development and diversity of filter-feeding whales—and the fish that first occupied that ecological3 niche4.

 

It had been thought that mammoth5, filter-feeding fish—which swam through the water with a gaping6, open mouth, collecting tiny marine7 creatures—only lived fleetingly8 before whales took their place in the food chain.

 

But a research team decided9 to take a closer look at museum fossils of bony, pre-historic fish that had either been misclassified or ignored. They also reexamined previous studies.The investigators10 now say that these fish filter-feeders lived from about 170 to 65 million years ago, a healthy stretch in which to pioneer and perfect the niche.

 

In a related study, scientists show that when filter-feeding whales took over from bony fish, their diversity was linked to the diversity of their dinner—the tiny creatures at the very bottom of the food chain –tiny algae11 known as diatoms.

 

New insights into some of the largest—and smallest—creatures on the planet.

 

—Cynthia Graber


 


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1 specimen Xvtwm     
n.样本,标本
参考例句:
  • You'll need tweezers to hold up the specimen.你要用镊子来夹这标本。
  • This specimen is richly variegated in colour.这件标本上有很多颜色。
2 attics 10dfeae57923f7ba63754c76388fab81     
n. 阁楼
参考例句:
  • They leave unwanted objects in drawers, cupboards and attics. 他们把暂时不需要的东西放在抽屉里、壁橱中和搁楼上。
  • He rummaged busily in the attics of European literature, bringing to light much of interest. 他在欧洲文学的阁楼里忙着翻箱倒笼,找到了不少有趣的东西。
3 ecological IrRxX     
adj.生态的,生态学的
参考例句:
  • The region has been declared an ecological disaster zone.这个地区已经宣布为生态灾难区。
  • Each animal has its ecological niche.每种动物都有自己的生态位.
4 niche XGjxH     
n.壁龛;合适的职务(环境、位置等)
参考例句:
  • Madeleine placed it carefully in the rocky niche. 玛德琳小心翼翼地把它放在岩石壁龛里。
  • The really talented among women would always make their own niche.妇女中真正有才能的人总是各得其所。
5 mammoth u2wy8     
n.长毛象;adj.长毛象似的,巨大的
参考例句:
  • You can only undertake mammoth changes if the finances are there.资金到位的情况下方可进行重大变革。
  • Building the new railroad will be a mammoth job.修建那条新铁路将是一项巨大工程。
6 gaping gaping     
adj.口的;张口的;敞口的;多洞穴的v.目瞪口呆地凝视( gape的现在分词 );张开,张大
参考例句:
  • Ahead of them was a gaping abyss. 他们前面是一个巨大的深渊。
  • The antelope could not escape the crocodile's gaping jaws. 那只羚羊无法从鱷鱼张开的大口中逃脱。 来自《简明英汉词典》
7 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。
8 fleetingly 1e8e5924a703d294803ae899dba3651b     
adv.飞快地,疾驰地
参考例句:
  • The quarks and gluons indeed break out of confinement and behave collectively, if only fleetingly. 夸克与胶子确实打破牢笼而表现出集体行为,虽然这种状态转瞬即逝。 来自互联网
9 decided lvqzZd     
adj.决定了的,坚决的;明显的,明确的
参考例句:
  • This gave them a decided advantage over their opponents.这使他们比对手具有明显的优势。
  • There is a decided difference between British and Chinese way of greeting.英国人和中国人打招呼的方式有很明显的区别。
10 investigators e970f9140785518a87fc81641b7c89f7     
n.调查者,审查者( investigator的名词复数 )
参考例句:
  • This memo could be the smoking gun that investigators have been looking for. 这份备忘录可能是调查人员一直在寻找的证据。
  • The team consisted of six investigators and two secretaries. 这个团队由六个调查人员和两个秘书组成。 来自《简明英汉词典》
11 algae tK6yW     
n.水藻,海藻
参考例句:
  • Most algae live in water.多数藻类生长在水中。
  • Algae grow and spread quickly in the lake.湖中水藻滋蔓。
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