名词
中文翻译：Unknown
同义词：
['gnashing of teeth', 'biting the lip']
例句：
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1. 咬唇
动作
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2. 嘴唇紧咬
状态
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1. She was so embarrassed that she couldn't stop lip-biting.
她非常尴尬，以至于不停地咬嘴唇。
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2. He was biting his lip anxiously, trying to suppress his fear.
他焦虑地咬着嘴唇，试图抑制恐惧。
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3. The child was lip-biting incessantly, showing signs of discomfort.
这个孩子不停地咬嘴唇，显示出不舒服的迹象。