The gunman is holding two children hostage in the building.
持枪歹徒把两个孩子扣押在这座建筑物里当作人质。
He dodged to left and right as the gunman opened fire.
持枪歹徒开火时他东躲西闪。
gunman详细解释
gun.man n.(名词)A man armed with a gun, especially an armed criminal or a professional killer.Also called gunslinger 枪手:持枪的人,尤其是持枪罪犯或职业杀手也作 gunslingerA man skilled in the use of a gun.射手:能熟练地使用枪枝的人