附加电源 meaning in English

exgt bat extension battery

Metal halide gas - discharge lamps possess the advantages of small sige , high luminous efficiency , long life good start quality , simply appending power supply . they are widely use in movie projectors and overhead projectors etc . the metal - halide gas - discharge lamps include metal halide lamps with dysposium iodide , mercury lamps metal halide lamps with scandium - sodium iodides and metal halide lamps with sodium - thal - lium - indium etc
金属卤化物放电灯具有体积小、发光效率高、使用寿命长、启动性能好附加电源较为简单等优点,一般用于电影放映机、投影仪等仪器,品种有金卤灯（汞灯）、镝灯、钪钠灯、钠铊灯等