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. 杀光; 把…灭绝
Their natural predators have been killed off. 他们的天敌已被灭绝。
It is an effective treatment for the bacteria and does kill it off. 这是一种有效的灭菌方法，确实把细菌都杀光了。
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