名词
中文翻译：外壳
同义词：
['case', 'cover', 'casing', 'shell', 'outer case']
例句：
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1. The new phone has asleek casing that is easy togrip.
这款新手机有一个光滑的外壳，很容易握持。
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2. The scientist used aspecial casing to protect the delicateequipment.
科学家使用一种特殊的外壳来保护那些精密的设备。
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3. The casing of thewatch was made from high-quality materials.
手表的外壳是由高质量的材料制成的。