a type of bronze used for parts subject to wear or corrosion (especially corrosion by sea water)
gunmetal详细解释
gun.met.al n.（名词）An alloy of copper with 0 percent tin.炮铜：一种掺有0％的锡的铜合金Metal used for guns.用来造枪的金属Color A dark gray.【色彩】 炮铜色：深灰色 【引伸】 gun.met.al adj.（形容词）
