名词
中文翻译：自然杂质
同义词：
['natural contaminant', 'naturalimpurity']
例句：
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1.The water was found to contain a highlevel of natural impurity.
发现水中含有高水平的自然杂质。
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2. The soil was testedfor its natural impurity content.
土壤被测试其自然杂质含量。
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3. The manufacturerhas reported that the product contains natural impurities.
制造商报告称该产品含有天然杂质。