a person or thing that injects something 注射者;注射器,注入器 ■(亦作 fuel injector)(in an internal-combustion engine) the nozzle and valve through which fuel is sprayed into a combustion chamber (内燃机)(燃料)喷嘴 ■(in a steam engine) a system of nozzles that uses steam to inject water into a pressurized boiler (蒸汽机)喷射器