就算使用了20年后,大部分的两角五分的硬币还是像最开始他们铸造的时候一样新.但是,大部分一分钱硬币就会变的很糙.在铸造流动币种时两角五分的硬币和一分钱硬币的金属材料说明了什么呢?
英语翻译Even after twenty years of use most quarters have the sa
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