名词
中文翻译：重残留物
同义词：
['residue', 'heavy fraction']
例句：
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1.The heavy residue in the oil is a major source of pollution.
油中的重残留物是主要的污染源。
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2. The heavy residue from the distillation process needs to be removed before use.
蒸馏过程中产生的重残留物在使用前需要去除。
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3. The heavy residue was found to contain toxic chemicals.
发现该重残留物含有有毒化学物质。