1. Impure drinking water is a cause of disease. 不洁的饮用水是引发疾病的一个原因。
2. The impure components captured in diamond can provide abundant information for the study of mantle fluid. 金刚石生长阶段所捕虏的不纯净组分，能够提供大量地幔流体的信息。
3. The mirror, being inherently pure, is never touched by the images it reflects, no matter how impure they may be. 镜子，天生就是纯洁的，从不会被它反映的景象所动，不管景象是如何的不纯洁。
英英解释
adj.
1. combined with extraneous elements
2. (used of persons or behaviors) immoral or obscene
3. ritually unclean or impure
