有一天动物园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。所以它们决定将笼子的高度由原来的十公尺加高到二十公尺。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三十公尺,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一百公尺。 One day Zookeepers found kangaroos ran out of the cage, so they met for discussion and agreed that the height of the cage was too low. So they decided to raise the height of the cage from 10 meters to 20 meters. The next day they found the kangaroo or ran outside, so they decided to further increase the height to 30 meters, did not expect the next day actually saw kangaroo all ran outside. As a result, the administrators were so nervous that they decided to raise the height of the cage to a hundred meters without stopping for two.