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1.Another major threat is the falling numbers of insects and the extinction of many species.
extinction 灭绝
An operation is beginning to try to save a species of crocodile from extinction.
一项努力拯救一个鳄鱼物种、使其免于灭绝的行动已经开始。
2.Scientists say the apocalypse could trigger, "a catastrophic collapse of Earth's ecosystems".
collapse 崩溃
The earthquake was the occasion of the building's collapse.
地震是房屋倒塌的起因。
