1. Insects have an exoskeleton, a hard outer covering that protects their bodies.
昆虫具有外骨骼,一种坚硬的外覆层,可以保护它们的身体。
2. The exoskeleton of a crab is made up of a series of hard plates called "exites".
螃蟹的外骨骼由一系列称为“外体”的坚硬板块组成。
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