下降的英語翻譯：

go down; come down; decline; descend; drop; fall; gravitate; plunge
degression
【醫(yī)】 descensus; descent
【經(jīng)】 decline; slump

管的英語翻譯：

canal; duct; fistula; guarantee; meatus; pipe; tube; wind instrument
【化】 pipe; tube
【醫(yī)】 canal; canales; canalis; channel; duct; ductus; salpingo-; salpinx
syringo-; tuba; tube; tubi; tubing; tubo-; tubus; vas; vaso-; vessel