by their own釋義：

通過自己的

例句：

Many women whose fathers left home unconsciously expect to be betrayed by their own mates.

許多父親棄家出走的婦女會在無意中料想她們會被自己的配偶所背叛。

on their own釋義：

憑自己的力量，他們自己；靜靜獨處

例句：

The kids said goodbye and off they went, the skinny girl with one of the boys and the other three on their own.

孩子們道聲再見就都走了，那個消瘦的女孩和其中的一個男孩子一起走的，其他三個是自己走的。

1.Their life seemed utterly distant from his own.他們的生活與他自己的生活似乎完全不同。

2.General Breymann had been shot dead, reportedly by one of his own men.布賴曼將軍遇刺身亡，凶手據說是他自己的一個手下。

3.He's an expert at getting his own way.他在如何達到自己的目的方面很在行。