名词
中文翻译：硬壳
同义词：
['shell', 'exoskeleton']
例句：
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1.The crab has a hard shell that protects it from predators.
螃蟹有一层坚硬的外壳来保护自己免受捕食者的伤害。
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2.The turtle has a hard exoskeleton to protect its soft body.
乌龟有一层坚硬的外骨骼来保护它柔软的身体。
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3. The scientist studied the structure of the animal's exoskeleton in order to understand its behavior.
科学家研究了动物外骨骼的结构，以了解其行为。