Impure drinking water is a cause of disease. 不洁的饮用水是引发疾病的一个原因。
An impure oxide of cobalt, used to produce a blue color in enamel and in the making of smalt. 浅的绿蓝色颜料，主要由钴和锡的氧化物组成。
The technological condition of Potassium Sulfate production from impure glaserite and impure Potassium chloride, is discussed in the paper,It is proved by experiment. 文章介绍了利用电解质溶液理论计算不纯净钾芒硝与不纯净氯化钾转化制取硫酸钾的工艺条件，并通过试验加以验证。
The streaks would be different if the coin was impure.
如果硬币不纯，条纹会有所不同。
吸血鬼日记第二季
He saw your bite, he said that your blood is impure.
他看到你身上的咬痕了，他说你的血已经不纯了。
TED演讲（音频版） 2016年4月合集
I was considered impure and forbidden from worshipping or touching any object of religious importance.
我被认定是不洁之人不允许参拜或触摸任何宗教物品。
变身怪医精选
It said: 'I am returning your chemicals, as they are impure and therefore useless.
“现将刚购的那批货退还，质地不纯，不合用途。
少年谢尔顿-第二季
And please protect me from impure thoughts, and teach me to respect the sanctity of my body.
请保护我不会有不纯洁的想法，教给我如何尊重我身体的圣洁。
奇思妙想物语
But once we add some contaminant to it, like food colouring for example, we say it's impure.
可是一旦我们在其中添加一些污染物，比如食用色素，我们就会说它不纯净。
环球慢速英语
These factories have equipment that refines the oil - the equipment removes all the impure elements from the oil.
这些工厂拥有精炼石油的设备--该设备可以去除油中的所有杂质。
赖世雄中级美语（下册）
They say she should have been banned from wrestling because it will cause the boys to think impure thoughts.
他们说应该禁止她摔跤，因为和她摔跤会使男孩子想入非非。
英语百科
Impurity
（重定向自Impure）
Impurities are substances inside a confined amount of liquid, gas, or solid, which differ from the chemical composition of the material or compound.
Impurities are either naturally occurring or added during synthesis of a chemical or commercial product. During production, impurities may be purposely, accidentally, inevitably, or incidentally added into the substance.