The skin of the larvae contains chitin, so they need not fear solvents or heat, and can protect their bodies. But their skin does not grow as the body does, so they must pass through molting five to seven times in a lifetime.
幼蟲皮膚富含幾丁質，不怕溶劑與高溫，可以保護身體，但皮膚不會跟著身體長大，因此成長過程必需經歷五到七次的蛻皮。