一些人睡觉时紧咬牙关或磨牙，这种情况称之为磨牙症。
Some people clench or grind their teeth while they sleep, a condition called bruxism.
很有可能是因为紧咬牙关抑制了消极情绪，只要嘴唇没紧张或者恐惧得发抖。
It might be that a "stiff" lip suppresses emotional response-as long as the lip is not quivering with fear or tension.
很有可能是因为紧咬牙关抑制了消极情绪，只要嘴唇没紧张或者恐惧得发抖。
It might be that a "stiff" lip suppresses emotional response-as long as the lip is not quivering with fear or tension.
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