English Original
The zoo built a special eight-foot-high enclosure for its newly acquired kangaroo, but the next morning the animal was found hopping around outside. The height of the fence was increased to 15 feet, but the kangaroo got out again. Exasperated, the zoo director had the height increased to 30 feet, but the kangaroo still escaped.
A giraffe asked the kangaroo, "How high do you think they'll build the fence?"
"I don't know," said the kangaroo. "Maybe a thousand feet if they keep leaving the gate unlocked."
中文翻译
动物园为刚引进的袋鼠建了一个八英尺高的特殊围栏，但第二天早上，人们发现这只动物正在围栏外蹦跳。围栏高度被增加到十五英尺，但袋鼠又跑了出来。动物园园长非常恼火，命人将高度增加到三十英尺，但袋鼠仍然逃脱了。
一只长颈鹿问袋鼠：“你觉得他们会把围栏建到多高？”
“我不知道，”袋鼠说，“如果他们一直不锁门，可能得修到一千英尺吧。”