A firefly is a type of beetle.

萤火虫一种甲虫。

Fireflies sparked in the darkness.

萤火虫在黑暗中发光。

The firefly is a holometabolic insect, passing through the stages of being an egg, being a larva, molting, and pupation.

萤火虫属于「完全变态」的昆虫，一生、幼虫、蜕皮、化蛹及羽化的过程。