cage

/keɪʤ/

an enclosure made or wire or metal bars in which birds or animals can be kept

中文释义：笼子；牢笼

The bird flew out of its cage when the door was left open.

门没关好时，那只鸟飞出了笼子。

Zoos are criticized for keeping animals in small cages.

动物园因将动物关在小笼子里而受到批评。