名词
中文翻译：外壳
同义词：
['shell', 'casing', 'outer shell']
例句：
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1.The new phone has a sleek casing design.
这款新手机拥有光滑的壳体设计。
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2. The engineer designed the casing to be lightweight and durable.
工程师设计壳体时，力求轻便耐用。
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3. The casing is made of high-quality plastic material.
壳体由高质量的塑料材料制成。