占领阵地后清洁炮管，准备战斗。
Artillerymen assigned to a brigade under the PLA 77th Group Army clean the barrels of a vehicle-mounted rocket launcher system during a round-the-clock training exercise on southwest China's Western Sichuan Plateau from August 8 to 11, 2018. (eng.chinamil.com.cn/Photo by Hu Jing, Li Chengde and Sun Zhenqi)
