He picked up the sheets of paper, and balled them tightly in his fists.

他捡起那几张纸，在手里紧紧地攥成团。

《柯林斯英汉双解大词典》

I believed that manhood required that I stand up to him, even if it meant fists.

那时，我认为，作为男子汉，我得勇敢地面对他，哪怕是吃拳头。

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Instinctively, he put up his fists.

攥紧拳头是他的一种本能。

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As the American flag was raised and the national anthem played they held up their fists -- Smith his right, Carlos his left -- in a Black Power salute.

CNN: Olympic memories: Black Power

Instinctively, he put up his fists.

ECONOMIST: Norman Mailer

Our closest relatives, chimpanzees and bonobos do not generally form fists, and the researchers think they are unable to: when a chimp curls up its fingers it forms a doughnut shape.

BBC: Fighting may have shaped evolution of human hand