Subway security staff then inspected the items, which turned out to be one 90-centimeter-long gun and one 15-centimeter-long gun and 50 rounds of ammunition.
地铁安保人员随后又检查了这些物品，发现了一把90厘米长和一把15厘米长的枪，另有50发子弹。
2
The fatigue life and cumulative damage of ammunition feeding spring in automatic naval gun of medium calibre have been analysed.
本文研究了中口径自动舰炮输弹簧的疲劳寿命及损伤规律。
3
Launching a certain amount of ammunition, it is easy to produce crack in the gun barrel and that will have effect on the security of fire.