The boy fell and scraped the skin off his knee.

这男孩摔了, 破了膝盖上的皮。

I barked my shin on a tree stump.

我磕到了树桩上，胫部破了皮。

He boohooed when he skinned his knee.

当他的膝盖破, 他大声哭了起来。

Jack skinned his knee when he fell.

杰克跌膝盖破了皮。

The bullet merely creased his shoulder.

子弹只不过破了他肩部的皮肤。

He skinned his knees when fell.

他摔破了膝部的皮肤。