adj.掺杂的，掺假的，脏的，不纯洁的
Impure drinking water is a cause of disease.
不洁的饮用水是引发疾病的一个原因.
The air of a big city is often impure.
大城市的空气往往是污浊的.
Impure novels have brought and are bringing much misery on the world.
不洁的小说已经给世界带来不幸,还将带来更多的不幸.
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