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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I felt my jaws clench and teeth grind together.

我感到双颚紧闭，牙齿紧紧咬在一起。

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I thought I heard his teeth clench together.

我想我听到了他咬牙发出的声响。

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I thought I heard his teeth clench together.

我想我听到了他咬牙发出的声响。

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