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- 假如没有纯净的水，人们喝什么？
Supposing that there is no pure water; what shall we drink?
- 白垩粉，白粉一种碾碎的并洗过的纯净白垩，用于油漆、墨水和油灰
A pure white grade of chalk that has been ground and washed for use in paints, ink, and putty.
- 纯净的水是可由蒸馏而得的。
Pure water is distillable.
- 我们必须确保饮用水的纯净。
We must ensure the purity of drinking water.
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