I hate to see birds in cages.

我不喜欢看到鸟在笼子里。

The animals were penned up in cages.

这些动物被关在笼子里了。

The birds smashed into the top of their cages in fright.

鸟儿们吓得猛撞笼顶。

Birds in outside cages develop immunity to airborne bacteria.

养在户外笼子里的鸟对空气传播的病毒有免疫力。

In their cages the monkeys were provided with touch screens.

在笼子里的猴子们有触摸屏。