A cicada throws its slough.

蝉是要蜕皮的。

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，一生历经卵、幼虫、蜕皮、化蛹及羽化的过。