Change the filter cartridge as often as instructed by the manufacturer.按照生产厂家的使用说明，经常更换过滤筒。The cartridge must be replaced at regular intervals.弹药必须定时更换。This rifle only holds one cartridge.这支来复枪只能装一发子弹....
Change the filter cartridge as often as instructed by the manufacturer.按照生产厂家的使用说明，经常更换过滤筒。This rifle only holds one cartridge.这支来复枪只能装一发子弹.He was attacked by a security man who tried to wrest away a gas cartridge.他遭到一名保...