例句：

　　To make a study of the kangaroo, he came to australia.

　　為了研究袋鼠，他來(lái)到了澳洲。

　　When I was waiting for you, I happened to see a kangaroo come by.

　　當(dāng)我在等你的時(shí)候，碰巧看到一只袋鼠經(jīng)過(guò)。

　　The kangaroo is indigenous to Australia.

　　袋鼠原產(chǎn)于澳大利亞。