A Sweeper was originally used to back up man-to-man defences.However, a Sweeper can also be used with a zonal marking system.是什么意思_A Sweeper was originally used to back up man-to-man defences.However, a Sweeper can also be used with a zonal marking system.在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句