rat是短元音: [ræt] 

The rat gnawed a hole through the wall.

耗子在墙上啃了一个洞。

The dog was worrying a rat.

那条狗撕咬著一只老鼠。

The dog scented a rat.

那狗嗅出有老鼠的气味。

The dog nosed out a rat.

那只狗闻到了老鼠的气味。

They said they'd help but they've ratted on us.

他们说要帮助我们，可是他们食言了。

But you promised to help us， you rat!

可是你答应过要帮我们的忙，你这言而无信的小人！