其他学生在她离开时笑得前仰后合。

Other pupils were laughing their heads off as she went.

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Other pupils were laughing their heads off as she went.

laughing 是动词 laugh 的现在分词形式,表示"笑"的动作正在进行。 their 是形容词性物主代词,表示"他们的"。 heads 是 head 的复数形式,指"头部"。 off 在这里是副词,表示"离开、脱离"的状态。 laugh their heads off 是一个英语习语,字面意思是"把脑袋都笑掉了",用来形容笑得非常厉害、前仰后合的样子。

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