I broke my left leg.

我的左腿骨折了。

Her left leg was asleep from sitting on the floor.

她的左腿在地板上坐得麻木了。

He winced as a sharp pain shot through his left leg.

他左腿一阵剧痛疼得他直龇牙咧嘴。

First he kicked the left leg, then he kicked the right.

他先踢左腿，然后踢右腿。

Every time he put any weight on his left leg he winced in pain.

每当他的左腿受力时，他就会疼得龇牙咧嘴。