1、The kangaroo is a unique animal found only in Australia.
袋鼠是澳大利亚独有的一种独特动物。

2、Kangaroos use their powerful hind legs to jump long distances.
袋鼠利用强壮的后腿能够跳跃很远的距离。

词性：名词；

网络释义：代人办事，充当代表。也指以某种身份行使职权。

1、She acted as my liaison while I was away.
我离开期间，她作为我的联络人。

2、The lawyer will act as the intermediary between the two parties.
律师将充当双方之间的中间人。