sacrificial anode
柯林斯词典
1. N an electropositive metal, such as zinc, that protects a more important electronegative part by corroding when attacked by electrolytic action 牺牲阳极[metallurgy]
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1. N an electropositive metal, such as zinc, that protects a more important electronegative part by corroding when attacked by electrolytic action 牺牲阳极[metallurgy]