例句：
Was it really the tooth of the dragonfly?
那真的是蜻蜓的'牙齿？
Where does a dragonfly spend most of its life?
蜻蜓的一生大部分在哪里度过？
When I looked back, the huge dragonfly was still there.
我回头看的时候，那只巨大的蜻蜓还在。
They caught a dragonfly and watched its wings carefully.
他们抓了一只蜻蜓，并仔细观察它的翅膀。
