Many of the deposits are too small, too impure . 许多蕴藏量太小，质地太不纯。
These are deliberately made impure by the admixture of a small amount of a different element . 通常采取加入少量其它元素的方法以有意使它不纯。
Their language was a bastard arabic, and yet they were not arabs; i was quite sure of that . 他们说着不纯的阿拉伯语，我敢肯定他们不是阿拉伯人。
The impurity of supposedly pure subcellular fractions is a constant threat to the plant biochemist . 以为亚细胞组分很纯而实际不纯的情况，一直是植物化学家感到难办的问题。
Recently, it has been shown that such substances, either by themselves or by virtue of their impurities or reaction products, are teratogens . 最近已经证明，这类物质，或是它们本身，或是它们的不纯物或反应产物，都是致畸形物。
His heart cannot be pure whose tougue is not clear . - - - 嘴不净者，心不纯。
The iron ore which we find in the earth is not pure 我们在地球上发现的铁矿是不纯的。
The impure mixture with impurity is purified 含杂质的不纯混合物被提纯。
There is no impurity so impure as old age 都没有年龄大了那种不纯的杂质
