很多“铜币”实际上是用青铜铸造的，其典型成分是约4%的锡和1%的锌。
"Most" copper "COINS are actually bronze, typically with about 4% tin and 1% zinc, or copper plating over base metal."
很多“铜币”实际上是用青铜铸造的，其典型成分是约4%的锡和1%的锌。
"Most" copper "COINS are actually bronze, typically with about 4% tin and 1% zinc, or copper plating over base metal."
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