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空气总管 kōngqì zǒngguǎn
met. air main
oil blast main
textile air manifold
wind. air header
空气总管〔主管路〕 kōngqì zǒngguǎn
gen. air-main
空气总管: 8 phrases in 4 subjects
Chemistry1
Compressors1
Nautical1
Technology5