In Sichuan, soldiers spent a hard time creeping across Luding Chain Bridge, which was made up of 13 iron chains, in the middle of gun fire.
在四川，士兵们在炮火中艰难地爬过由13条铁链组成的泸定铁桥。
2
Transmission chain of gun servo system has backlash, it is one of the important factors that affect dynamics performance and stable precision of gun system.
火炮伺服系统传动链存在传动齿隙，齿隙是影响火炮伺服系统动态性能和稳态精度的重要因素之一。
3
In this paper, in the full analysed the merits and synthesized the medium-caliber gun feeding system at home and abroad, then we proposed a shell-feeding system with untreaded chain style.