名词
中文翻译：金属外壳
同义词：
['metal shell', 'metal housing']
例句：
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1. The new phone has asleek metal casing that is easyto grip.
这款新手机有一个光滑的金属外壳，握起来很方便。
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2. The robot's metal casing made itdifficult for us to see inside.
机器人的金属外壳让我们很难看到里面。
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3. The car's metal casing was designedto protect the interior from damage.
汽车的金属外壳设计用来保护内部免受损坏。