名词
中文翻译：Unknown
同义词：
['shell running', 'shell operation']
例句：
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1. The machine is designed torun smoothly on its casing.
这台机器设计得能在其外壳上平稳运行。
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2. The casing of the engineis made of high-quality steel.
发动机的外壳是由高质量的钢材制成的。
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3. The casing was damaged during the accident.
事故中外壳受损。