单词：exoskeletal
exoskeleton的用法和样例：
例句
- The old, empty exoskeleton is called an exuvia.脱去的旧的空的外骨骼被称为蜕。
- The exoskeleton of insects is largely made of protein and chitin.昆虫的外骨骼大部分是由蛋白质和几丁质组成的.
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