例句：

　　Was it really the tooth of the dragonfly?

　　那真的是蜻蜓的牙齒？

　　Where does a dragonfly spend most of its life?

　　蜻蜓的一生大部分在哪里度過(guò)？

　　When I looked back, the huge dragonfly was still there.

　　我回頭看的時(shí)候，那只巨大的蜻蜓還在。

　　They caught a dragonfly and watched its wings carefully.

　　他們抓了一只蜻蜓，并仔細觀(guān)察它的翅膀。