People are working hard to find ways to keep the earth clean: they treat waste gases, protect water sources and purify waste water.
人们努力寻找方法保持地球清洁：他们对待废气，保护水源，净化废水。
He must purify himself with the water on the third day and on the seventh day; then he will be clean.
那人到第三天要用这除污秽的水洁净自己，第七天就洁净了。
The depurator could purify air microorganisms at the workshop, with a purifying rate of 53.1%, but it did not reach the standards of clean air.
空气净化器虽然能够净化生产车间中的空气微生物，但其净化率为53.1%，净化后的空气未达到洁净空气的标准，因此还应同时采取其他相应净化措施。
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