我们俩都太累了,所以立刻去睡觉了。

We both were so tired that we went to bed at once.

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We both were so tired that we went to bed at once.

at 是介词,表示"在...时候"或"处于...状态"。 once 是副词,意思是"一次",也可以表示"曾经"。 at once 是一个固定短语,意思是"立刻、马上",表示动作立即发生。

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