I tore my jeans on the fence.

我的牛仔裤被篱笆挂破了。

I ripped my jeans on the fence.

我的牛仔裤在栅栏上划破了。

They are sitting on the fence and refusing to commit themselves.

他们保持中立，拒绝明确表态。

Two birds settled on the fence.

两只鸟落在篱笆上。

A robin was perching on the fence.

一只知更鸟落在篱笆上。