名词
中文翻译：硬壳
同义词：
['shell', 'hard shell', 'tough shell']
例句：
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1.The turtle has a hard shell to protect it from predators.
乌龟有一层硬壳来保护自己免受捕食者的伤害。
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2.The crab has a tough shell that makes it difficult for predators to eat it.
螃蟹有一个坚硬的外壳，这使得它很难被捕食者吃掉。
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3. The bird's feathers are soft and flexible, providing protection from the elements.
鸟的羽毛柔软且有弹性，为它们提供了对恶劣天气的保护。