But I don't understand how you let him get away.我不明白你们怎么会让他逃走

get away逃脱；离开

He had an itch to get away and explore.

他等不及要动身去探险。

I won't let him get away with that excuse.

我不会让他用那种借口蒙混过去。

I'd like to go home.我要回家

I'd like我想要,=I would like

I'd like a room on the upper level.

我想要楼上的房间。

but why on earth would you feel the need to give her everything?你为什么会觉得要把一切都给她呢

on earth究竟； 到底

How on earth do they manage to rob the bank?

他们到底怎么抢了银行的？

Who on earth is that female he's with?

跟他在一起的那个女人究竟是谁?