减装药 meaning in English

fractional charge
reduced charge

Derived from the 1929 fortress gun ( itself a development of the old 1897 field gun ) with a semi - automatic breech and an automatic loader added , the " high power " apx 75mm gun fired a mle 1915 he round with a reduced charge at 400 m / s and the mle 1915 ap round at 570 m / s ( 50mm penetration at 1000 m ) and its two sights and stereoscopic rangefinder allowed a direct fire range of 2000 m
“大威力” apx型75毫米炮由1929型要塞炮（旧式1897型野炮的发展型）衍生而来，加装了半自动炮尾和一个自动装填器，发射减装药的1915型高爆弹（初速400米/秒），及1915型穿甲弹（初速570米/秒， 1000米距离可穿透50毫米装甲）。