环保主义者预计，目前全球物种灭绝的速率是人类出现前的历史背景速率的1000倍。

Conservationists estimate that extinctions worldwide are occurring at a pace that is up to 1, 000 times as great as history's background rate before human beings began proliferating.

youdao

环保主义者预计，目前全球物种灭绝的速率是人类出现前的历史背景速率的1000倍。

Conservationists estimate that extinctions worldwide are occurring at a pace that is up to 1, 000 times as great as history's background rate before human beings began proliferating.

youdao