One day the staff members of a zoo called a meeting to discuss the problem--how to deal with the kangaroos that were found out of the cage. They came to the conclusion that the cage was placed too low and decided¹ to raise it from one to two meters high. But the next day the kangaroos were still at large and they again raised the cage to three meters.

有一天，动物园的管理员们发现袋鼠从笼子里跑出来了，于是开会讨论，一致认为是笼子的高度过低，所以他们决定将笼子的高度由原来的1米加高到2米。结果第二天他们发现，袋鼠还是跑到外面来，所以他们又决定再将高度加高到3米。

Quite beyond their expectation the next morning they saw the kangaroos still free to go about. They were alarmed and determined² to go to all the length by raising the cage to the height of ten meters.

没想到隔天居然又看到袋鼠全跑到外面，于是管理员们大为紧张，决定一不做二不休，将笼子的高度加高到10米。

Later a giraffe, while chatting with some kangaroos, asked them, “Do you think they will go on raising your cage?”

一天，长颈鹿和几只袋鼠在闲聊，“你们看，这些人会不会再继续加高你们的笼子?”长颈鹿问。

“Hard to say,” said a kangaroo, “if they continue forgetting to fasten the cage door.”

“很难说。”袋鼠说，“如果他们再继续忘记关门的话!”