他激动地握紧拳头说。

He would declare , clenching his sanguine fist

松开拳头，握紧拳头

Loose fists ; and clench fists

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.

他愤怒地握紧拳头。

He doubled up his fists in anger.

当他想要将手伸出罐子的时候，他发现，灌口太小，他握紧拳头不能出来。

When he tried to take his hand out of the jar, however, he found that the opening was too narrow for his clenched fist to pass through.

什么事情也没有发生。哈利握紧拳头以防手发抖。

Nothing happened. Harry clenched his hands to stop them shaking.

如果握紧拳头的话，你只能对抗这个世界；可是张开双手的话，你就可以拥抱全世界…

If the clenched fist, you can only fight in this world; but with open hands, you can embrace the world …

mean的含义：美式英语-愤怒，不幽默，英式英语-不慷慨，握紧拳头。

Mean: American English - angry, bad humored, British English - not generous, tight-fisted.