blister copper

blister-copper的词性：
n.（名词）

1. An almost pure copper produced in an intermediate stage of copper refining.
粗铜：炼铜的中间过程所产生的一种几乎为纯铜的铜

blister-copper的词源：

2. [From its blistered appearance]
[源自其有浮疱的表面]