air purity

A Comparative Study on Air Purifications by Effective Purity Ventilation and by Ultraviolet Irradiation

有效清洁自然通风与紫外线照射空气净化作用对比研究

On certain degree, it may be said that landscape poems were born out of poems of metaphysics, which gave the former the air of purity, and the thinking of Lao Tsu and Zhuang Tsu made people yearn towards the nature.

在一定程度上可以说玄言诗孕育了山水诗。玄学使山水具有清越之气，老庄思想使人们向往自然。

Application and management of air purity technique in operation room

空气洁净技术在手术室的应用及管理

Effective air handling and regeneration system is needed to wipe off harmful impurity inside enclosed space and to maintain required air purity and necessary gas element since the air inside the enclosed space can't exchange with the atmosphere.

封闭舱室不能与大气中的空气进行交换，必须去除舱室中有害杂质，维持必需的气体成分和纯净度，需要一套有效的空气调节和再生装置来完成这一任务。