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(单词翻译)
This is Scientific American’s 60-Second Science. I’m Steve Mirsky. Got a minute?
The November 26th issue of the journal Science included a study showing that the extinction1 of the dinosaurs2 some 65 million years ago allowed puny3 mammals to get really big. But well before all that happened, another event triggered a different burst of evolutionary4 activity.
A new study finds that about 300 million years ago, the tropical rainforests along the equator fell apart. The familiar culprit—global warming.
Present-day Europe and North America were on the equator back then, and were covered with rainforests. But global warming made things even hotter and drier.
The expansive rainforests broke up into smaller fragments, and reptile5 populations became isolated6 from each other in the fragments. Such geographical7 isolation8 allows different populations to evolve in different directions, which led to a great increase in reptile diversity. The research appears in the journal Geology. The explosion in reptiles9 ultimately led to the evolution of the dinosaurs, which dominated the planet until they fell victim to the massive impact that allowed us mammals to take over. As Vonnegut would say, so it goes.
Thanks for the minute. For Scientific American’s 60-Second Science, I’m Steve Mirsky.
1 extinction | |
n.熄灭,消亡,消灭,灭绝,绝种 | |
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2 dinosaurs | |
n.恐龙( dinosaur的名词复数 );守旧落伍的人,过时落后的东西 | |
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3 puny | |
adj.微不足道的,弱小的 | |
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4 evolutionary | |
adj.进化的;演化的,演变的;[生]进化论的 | |
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5 reptile | |
n.爬行动物;两栖动物 | |
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6 isolated | |
adj.与世隔绝的 | |
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7 geographical | |
adj.地理的;地区(性)的 | |
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8 isolation | |
n.隔离,孤立,分解,分离 | |
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9 reptiles | |
n.爬行动物,爬虫( reptile的名词复数 ) | |
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