1)gas down take,煤气降下管2)underjet gas duct,下喷煤气管道3)decrease in coal quality,煤质下降4)rich gas cellar main,地下室富煤气主管5)underground gas,地下煤气6)air descend,气流下降
用法例句
Two measures taken in boiler aiming at decrease in coal quality;
针对煤质下降问题的两项锅炉改进措施
A comparison experiment between the common flue-cured house with air descend and the improved close flue-cured house was conducted to investigate the flue-cures cost and economic benefit.
