air cleanliness 空气洁净度
air cleanliness class 空气洁净度等级 ; 空气洁净度级别
Classification of air cleanliness 空气洁净分类 ; 空气洁净度分级 ; 空气清洁度的分级
Laminar air cleanliness 空气层流洁净度
air cleanliness classification 空气洁净度级别
classes in air cleanliness 空气洁净度级别
classes of air cleanliness 空气洁净度等级
air cleanliness clbut rinside thehert 气氛明净度等级
air r cleanliness 空气洁净度
The less people gather in one place, the less they find evil, the evil and the bad. The cleanliness of the air contributes greatly to the cleanliness of fashion.
一个地方人聚集得越少，在那儿就越少发现罪恶，违法行为和坏思想。空气的洁净大有助于风尚的洁净。
Clean Bench length of life related to the degree of air cleanliness.
超净台使用寿命的长短与空气的洁净程度有关。
A town-dweller was visiting the country and was prising the cleanliness of the air.
一个城里人到乡下去游玩，他特别赞赏那里洁净的空气。
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