人们特别注意到，在深度睡眠时，左脑更加活跃。

It was specifically observed that the left side of the brain was more active during deep sleep.

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进行一些有趣的课堂活动可以使学生在课堂上更加活跃。

Having some fun classroom activities can make students more active in class.

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从那以后，我变得更加活跃和外向。

Since then, I've become more active and outgoing.

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