sacrificial anode

sacrificial-anode的词性：
n.Metallurgy （名词）【冶金学】

1. An anode that is attached to a metal object, such as a boat or an underground tank, to inhibit corrosion of the object. The anode is electrolytically decomposed while the object remains free of damage.
牺牲阳极：粘在一个金属物品（如船或地下容器）以使物品免受腐蚀的阳极。这个阳极会电解腐蚀而物品却能免受损害