| 单词 | mass extinction |
| 释义 | > as lemmasmass extinction mass extinction n. Biology extinction involving numerous species or higher taxa; a specific extinction event of this kind. ΘΚΠ the world > life > biology > balance of nature > [noun] > extinction mass extinction1943 1943 Amer. Antiquity 8 214 Mass extinction is not a phenomenon confined to the Quaternary nor solely explainable in human terms. 1956 Evolution 10 101/1 Perhaps it is futile to search for a single cause for all of the great mass extinctions. 1989 S. J. Gould Wonderful Life (1991) 54 The late Cretaceous mass extinction, some 65 million years ago, sets the boundary between Mesozoic and Cenozoic eras. 2017 New Scientist 14 Oct. 38/2 Asia suffers from a perennial air pollution crisis, we are still cutting down 15.3 billion trees each year, ocean fish stocks are depleted, and conservation biologists say a sixth mass extinction is under way. < as lemmas |
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