南美某国家的一个动物园为新来的袋鼠修建了一个一米高的围栏。可是第二天人们发现这个小家伙居然在围栏外面蹦蹦跳跳。于是工作人员又把围栏加高到两米,可小袋鼠同样又跑了出来。 A zoo in a South American country built a one-meter-high fence for newly arrived kangaroos. But the next day people found that this little guy actually bounce outside the fence. So the staff raised the fence again to two meters, but the kangaroo also ran out.