科学美国人60秒 SSS 2014-09-19_在线英语听力室

(单词翻译:双击或拖选)

66 million years ago, the check shoot the media right, a rock over 60 miles wild, snapped in to the earth. And you know what happened next, the dinos disappeared. But BB says to consider the big picture for a moment.You have to think not only about the animal walking on the planet but also all of resources on which animals are depending.

Say for example, dedutation. B has been giving those overshadow impact baken there do. After all, more than half the plants be seen as temperal Northern America, parished along with the dinosaurs¹. And the type of plants throughout the impact were different as well. B and his colleagues studied thousands of fossil leaves from North T. Spending about millions years both before and after the impact, they measured leaves mass per area. Approxime for how much energy are planning vast its leaves, and the density² of veins³, which indicates how fast growing the leaf is. Sterty slow growing leaves tend to be evergreens⁴, when as fluency⁵ fast growing leaves are harmarch can calmsiduales plants.

Turns out the affect impact that fossil record has more disiduaes looking lit. So just in the fast growing more adaptable⁶ seasonal⁷ plants beat out the competition after the big heat. The study is here in the journal PLOS Biology.

And it kind of makes I wonder for we haven't overlook to another theory for why are the dinos died out. Maybe they just being careful the test did the situates leaves.

点击

收听单词发音

1 dinosaurs
n.恐龙( dinosaur的名词复数 )；守旧落伍的人，过时落后的东西
参考例句：
The brontosaurus was one of the largest of all dinosaurs. 雷龙是所有恐龙中最大的一种。来自《简明英汉词典》 Dinosaurs have been extinct for millions of years. 恐龙绝种已有几百万年了。来自《简明英汉词典》

2 density
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。

3 veins
n.纹理；矿脉( vein的名词复数 )；静脉；叶脉；纹理
参考例句：
The blood flows from the capillaries back into the veins. 血从毛细血管流回静脉。来自《简明英汉词典》 I felt a pleasant glow in all my veins from the wine. 喝过酒后我浑身的血都热烘烘的，感到很舒服。来自《简明英汉词典》

4 evergreens
n.常青树，常绿植物，万年青( evergreen的名词复数 )
参考例句：
The leaves of evergreens are often shaped like needles. 常绿植物的叶常是针形的。来自《简明英汉词典》 The pine, cedar and spruce are evergreens. 松树、雪松、云杉都是常绿的树。来自辞典例句

5 fluency
n.流畅，雄辩，善辩
参考例句：
More practice will make you speak with greater fluency.多练习就可以使你的口语更流利。 Some young children achieve great fluency in their reading.一些孩子小小年纪阅读已经非常流畅。

6 adaptable
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
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。

在线英语听力室_免费在线英语听力学习网站

科学美国人60秒 SSS 2014-09-19