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,一致认为是因为笼子的高度过低。于是,他们将笼子的高度由原来的十米加高到二十米。第二天,他们发现袋鼠还是跑到外面来,所以决定再将高度加高到三十米。没想到,转天袋鼠居然又跑到了外面。管理员们大为紧张,决定一不做二不 One day, the zookeeper found kangaroos ran out of the cage, then met to discuss, agreed that the cage height is too low. So, they raised the height of the cage from the original ten meters to twenty meters. The next day, they found that the kangaroo still ran outside, so decided to raise the height to 30 meters. Unexpectedly, day kangaroo actually went outside. Administrators are so nervous they decide not to do it or not