伊恩用膝盖撞击他的腹股沟。

Ian kneed him in the groin.

《柯林斯英汉双解大词典》

苏珊把手枪放到一旁，脚趾和大腿使劲地抵着地面，膝盖微微地向前屈，一只脚伸到另外一只脚前面一点的地方，以便能够更好地迎接即将到来的撞击。

Susan set the Glock aside and braced her toes and legs, bending at the knees slightly, one foot slightly ahead of the other to better prepare for impact.

youdao

我想小库由于撞击重重的摔倒地上，一个膝盖随之而来，像切赫受伤一样，在那种速度下的撞击，他们后来竟然还在笑。

Carlo I think was knocked out as a consequence of the way he hit the ground, but a knee coming at Petr like that, at such speed - the boy was even laughing afterwards.

youdao