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1·Henceforward all my doubts and fears are set at naught for ever.

我的疑惑与恐惧自此以后都永远受蔑视。

2·Her dream of becoming a film star was set at naught after a car accident.

她想成为电影明星的梦想在一次车祸后化为乌有。

3·I set his promise at naught.

我把他的诺言看得一文不值。

4·Don't set my words at naught, they are the outcome of experience.

不要把我的话当话，这是经验之谈。