emergency unitstandby machineunit， spareunit， standby备用: reserve; spare; alternate; b ...机件: parts; work; machine member; ...备用机: guard machine; guest machine; reserve machine; spare machine备用机场: alternate aerodrome; alternate airfield; alternate airport; deployment base; field alternate; reserve airdrop; supplementary aerodrome; surplus airfield备用机车: emergency engine; emergency episode; stored locomotive下载手机词典可随时随地查词查翻译
