I punched him on the chin, sending him reeling backwards.

我一拳击中他的下巴，打得他向后打了个趔趄。

《牛津词典》

I did fight him, I punched him but it was like hitting a wall.

我确实打了他，我用拳头打他，却像打在一面墙上。

《柯林斯英汉双解大词典》

I punched him in the arm a few times but he didn't move.

我撞了他手臂几下，但他一动也不动。

youdao