Some people clench or grind their teeth while they sleep, a condition called bruxism.

一些人睡觉时紧咬牙关或磨牙，这种情况称之为磨牙症。

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This action was to clench either their right or their left hand into a fist.

这个活动是左手或右手握紧拳头。

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This action was to clench either their right or their left hand into a fist.

这个活动是左手或右手握紧拳头。

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