他握紧拳头来显示自己的力量。
He clenched his fist to make a show of strength.
youdao
他握紧拳头，脸涨得通红。
He clenched his fist and his face was very red.
医生告诉他放松自己，别像那样握紧拳头。
The doctor told him to relax and not to clench his hands like that.
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