上气不接下气 out of breath ; I got out of breath when I climbed those stairs ; gasp ; out of air

地下气化 [矿业] underground gasification ; in situ gasification ; gasification in place ; underground coal gasification

皮下气肿 aerodermectasia ; pneumoderma ; retro-peritioneal

煤炭地下气化 UCG ; underground coal gasification

地下气象 The Weather Underground ; Weather Underground

低声下气 Humbly ; Grovel ; tolerantly ; Timid

皮下气孔 subskin blowhole ; subsurface porosity ; subsurface pinholes ; subskin bloall

皮下气泡 subsurface bubble ; rim hole ; subcutaneous blow hole ; subsurface blowholes

井下气体分离器 downhole gas separator

井下气体燃烧器 downhole gas burner