词汇	useful duty
释义	useful duty 有益的工作,值得高度赞扬的职责
随便看	air borne air-borne Airborne Acoustic Information System airborne acquisition airborne action Airborne Active Expendable Decoy airborne active jamming Airborne Active Sonobuoy System airborne activity air-borne activity Airborne Advanced Command Post Airborne Advanced Communications System Airborne Adverse Weather Weapons System Airborne Adverse Weather Weapon System airborne aerobic bacteria airborne afmag method Airborne Air Control Squadron airborne aircraft hour Airborne Airfield Lighting System airborne alert airborne alert aircraft Airborne Alert Weapon System airborne allergen air-borne allergen airborne all-round radar