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？
When I looked back, the huge dragonfly was still there.
我回頭看的時候，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(xì)觀察它的翅膀。