River filtration systems purify surface water flowing through this system to some extent, but degree of purification is not known.
河流渗滤系统对入渗的地表水有一定的净化作用，过去人们很少从理论上研究河流渗滤系统对污染河水的净化作用。
A plan of using electrostatic precipitator to achieve air purification is proposed to solve the problem of filtration of tobacco air conditioning system.
本文针对烟厂通风空调系统过滤难的问题，提出采用静电集尘器方案实现空气净化。
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