extinction可數(shù)嗎

　　This period of extinction wasn't comprehensive.

　　這一時(shí)期的滅絕并不徹底。

　　What could cause such high rates of extinction?

　　是什么導(dǎo)致了如此高的物種滅絕率？

　　One consequence of global warming is extinction.

　　全球變暖的后果之一是物種滅絕。