名词
中文翻译：燃料外套
同义词：
['fuel cap', 'fuel cover', 'oil jacket']
例句：
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1. The engine was protected by a fuel jacket to prevent overheating.
发动机被一个燃料外套保护，以防过热。
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2. The engineer carefully removed the fuel jacket before starting the engine.
工程师在启动发动机前小心地移除了燃料外套。
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3. The fuel jacket is designed to keep the engine cool during operation.
燃料外套的设计是为了在运行过程中保持发动机冷却。