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科学美国人60秒 SSS 2014-09-22

时间:2014-10-21 08:40:30

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(单词翻译)

 Sixty-six million years ago, the meteorite1, a rock over six miles wide, slammed into the earth and you know what happened next, the dinos disappeared. but Benjemin Blunder, a planty ecologist at the University of Arizona, says ," consider the picture for a moment."

  You  have to think not only about the charismatic animals which are walking on the planet but also all the resources on which those animals are depending.
  Say, for example, vegetation. Blunder has been giving those overshadowed impact victims their due. After all, more than half  the planet's species in temporary North America periched along with the dinosours. And the type of plants that thrived after the impact were different as well. Blunder and his colleagues studied thousands of fossile leaves from North Dokotar, spanning about a million years both before and after the impact. They measured the leaf mass per area, a proxy2 for how much energy a plant invests in its leaves, and density3 vein4 s, which indicates how fast growing the leaf is. Sturdy, slow-growing leaves tend to  be ever-greens, whereas the flimsy, fast-growing leaves are hall marks of decidous plants. Turns out that after the impact the fossile records have more deciduously looking leaves, suggesting that fast-growing, more adaptable6 seasonal7 plants beat out the competition after the big hit. The study appears in the journal" Plus Biology". And it kind of made me wonder if we have overlooked another theory for why the dions died out. Maybe they just didn't care for the taste of the deciduous5 leaves.

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1 meteorite 2wNy1     
n.陨石;流星
参考例句:
  • The meteorite in Jilin Exhibition Hall is believed to be the largest in the world.吉林展览馆的陨石被认为是世界上最大的。
  • The famous Murchison meteorite smashed into the Australian ground in 1969.1969年著名的默奇森陨石轰然坠落在澳大利亚。
2 proxy yRXxN     
n.代理权,代表权;(对代理人的)委托书;代理人
参考例句:
  • You may appoint a proxy to vote for you.你可以委托他人代你投票。
  • We enclose a form of proxy for use at the Annual General Meeting.我们附上委任年度大会代表的表格。
3 density rOdzZ     
n.密集,密度,浓度
参考例句:
  • The population density of that country is 685 per square mile.那个国家的人口密度为每平方英里685人。
  • The region has a very high population density.该地区的人口密度很高。
4 vein fi9w0     
n.血管,静脉;叶脉,纹理;情绪;vt.使成脉络
参考例句:
  • The girl is not in the vein for singing today.那女孩今天没有心情唱歌。
  • The doctor injects glucose into the patient's vein.医生把葡萄糖注射入病人的静脉。
5 deciduous 992yy     
adj.非永久的;短暂的;脱落的;落叶的
参考例句:
  • Overgrown deciduous shrubs can be cut back at this time of year.过于繁茂的落叶灌木可以在每年的这个时候修剪。
  • Deciduous trees shed their leaves in autumn.落叶树木在秋天落叶。
6 adaptable vJDyI     
adj.能适应的,适应性强的,可改编的
参考例句:
  • He is an adaptable man and will soon learn the new work.他是个适应性很强的人,很快就将学会这种工作。
  • The soil is adaptable to the growth of peanuts.这土壤适宜于花生的生长。
7 seasonal LZ1xE     
adj.季节的,季节性的
参考例句:
  • The town relies on the seasonal tourist industry for jobs.这个城镇依靠季节性旅游业提供就业机会。
  • The hors d'oeuvre is seasonal vegetables.餐前小吃是应时蔬菜。

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