air extraction piping 抽空气管道
air extraction main 抽气总管 ; 抽气总管道
air extraction system 抽空气系统
CAX Compartment Air Extraction 抽风舱
gap suitable for air extraction 抽风间隙
air extraction plant 抽气装置 ; 抽气设备
Air Extraction 空气通风口 ; 排空气
Open air extraction 开式抽气
However, rare earth is often radioactive. Moreover, in the smelting and extraction of rare earth, dangerous chemicals are frequently used, thus polluting local air, water and land.
但是，稀土生产往往带有放射性，加工企业在冶炼和分离稀土时，也经常使用危险的化学品，周围的空气、水和土地容易遭到污染。
Extraction of air is required at cooking surfaces.
在烹饪中提取所需空气表面。
When using this product, we strongly recommend that you always work in a well-ventilated area, preferably with some form of air extraction system.
我们强烈建议您在通风良好处使用本调色液，最好在拥有通风系统处使用。
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