他在紧张时会不自觉地握紧拳头。

He keeps clenching his fists unconsciously when nervous.

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He keeps clenching his fists unconsciously when nervous.

clenching 是动词 clench 的现在分词形式。clench 的意思是"紧握、咬紧",指用力收紧或握紧某物,如拳头或牙齿。

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