最关键的是,need这里当名词用,表示需求,need for sth 是表示对某物的需求.
表示没有…的时候,可以用no,比如no food 、no water.
如果直接用need,那么是当动词用,They don't need knives.
there's no need for knives.为什么no不用not.为什么用need for.直接用need不行
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