We must change clothes often and do more exercise.

我们必须经常换衣服并且多做锻炼。

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For example, some teens may comb their hair endlessly, change their clothes often, and constantly look in the mirror to see how they look to others.

例如，一些青少年可能没完没了地梳头，经常换衣服，经常照镜子，看看自己在别人眼中是什么样子。

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I had to wash my hands and change my clothes often.

我不得不经常洗手和换衣服。

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