名词
中文翻译：保护壳
同义词：
['protective cover', 'protective case', 'armored shell']
例句：
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1. The car hasa protective shell to protect the engine from damage.
这辆车有一个保护壳来保护发动机免受损坏。
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2. The spacecraft had a protective shell to protect it from impacts.
宇宙飞船有一个保护壳来保护它免受撞击。
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3. The soldier was wearing a protective shell to protect himself from shrapnel.
士兵穿着一个保护壳来保护自己免受弹片的伤害。