名词
中文翻译：Unknown
同义词：
['heavy oil', 'heavy bitumen']
例句：
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1.The heavy tar has been causing a lot of pollution in the area.
这种重油已经给该地区造成了严重的污染。
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2. Heavy tar is used to make asphalt and other road materials.
重油被用来制造沥青和其他道路材料。
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3. The heavy tar was found to be contaminated with heavy metals.
发现这种重油被重金属污染了。