名词
中文翻译：真空残留物
同义词：
['vacuum residue', 'residual gas', 'residual oil']
例句：
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1. The vacuum cleanerleft a vacuum residuum on the floor.
吸尘器在地板上留下了真空残留物。
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2. The residual oil in the engine needs to be drained before it can be reused.
发动机中的剩余油需要排空才能重新使用。
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3. The process of distillation leaves a vacuum residuum that must be removed before further processing.
蒸馏过程留下一个真空残留物，必须在进一步处理前去除。