The gunner lowered the muzzle of the howitzer, opened the gun's breech-block, and peered through the barrel at the target. 炮手降低了榴弹炮炮口，打开大炮后膛，通过身管目测目标。
The crew chiefs or door gunners on transport helicopters usually have some sort of machinegun or gattling gun at their disposal. 运输直升机上的机组长或舷炮手通常根据不同的任务选择普通机枪或转管机枪。
