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air relief
archit. 气口 (管)
dril. 排气
oil 放气
shipb. 放气门
tech. 放气 (门); 空气排放
air relief: 28 phrases in 14 subjects
Agriculture2
Architecture1
Automobiles1
Aviation1
Chemistry1
Compressors1
Explosives and Explosive Ordnance Disposal1
Hydroelectric power stations1
Mechanic engineering1
Metallurgy2
Refrigeration2
Shipbuilding2
Space1
Technology11