他沮丧地用拳头猛捶桌子。

He slammed his ___fist on the desk in frustration.

绝望中，他用双拳捶打着那扇金属门。

In desperation, he pounded on the metal door with his ___fists.

作为团结的象征，他们在比赛前碰了碰拳头。

As a sign of solidarity, they bumped ___fists before the game.