kill off
柯林斯词典
1. →see kill
2. PHRASAL VERB If you say that a group or an amount of something has been killed off, you mean that all of them or all of it have been killed or destroyed. 殺光; 把…滅絕
Their natural predators have been killed off. 他們的天敵已被滅絕。
It is an effective treatment for the bacteria and does kill it off. 這是一種有傚的滅菌方法，確實把細菌都殺光了。
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