1.
They clean the air and keep water from running away.
它们净化空气，保持水土。
2.
Trees help clean the air.
树木有助于净化空气。
3.
Preparation of Air Purification Mineral Wool Board and Research on Purifying of Formaldehyde
净化空气矿棉板的制备及其净化甲醛性能研究
4.
Trees also improve the air! And they make the park look beautiful!
树还可以净化空气！美化公园！
5.
the process of exposing to air (so as to purify).
使空气通畅（以达到净化空气目的）的过程。
6.
Granular activated carbon from coal for air purificatio
GB/T7701.5-1997净化空气用煤质颗粒活性炭
7.
Oil-Free Lubrication & Air Purification
无油润滑及空气净化
8.
Remove air cleaner housing.
拆去空气净化器外壳。
9.
air cleaner and silencer
空气净化器及消声器
10.
Fresh air cleans the blood.
新鲜空气能净化血液。
11.
The Effect of AOS-80 Air Cleaning Devices on Air Quality of Henhouse in Winter
AOS-80空气净化机对冬季鸡舍空气的净化作用
12.
Efficacy of air-purifying system on purifying air of operating department in hospital
空气净化系统对医院手术部空气净化效果分析
13.
The study of air purifing effects of the vehicle-inner cleaner
车用净化器对车内空气质量净化效果的研究
14.
Efficacy of TA series of air purifiers in purification of indoor air
TA系列空气净化机对室内空气净化效果的应用观察
15.
Status of Air Purification in Different Situations of Clean Operating Room
洁净手术室不同状态下空气净化状况测量
16.
Study of Indoor Air Cleaning Devices under the Light Irradiation;
TiO_2/ACF光催化的室内空气净化装置研究
17.
A Study on the Regeneration and Utilization of Lithium Hydroxide Used as Gas Purificant;
空气净化用氢氧化锂的再生利用研究
18.
Study on Photocatalysis Indoor Air Purifier
光催化室内空气净化器的研究与开发