The silver coinage was repeatedly debased with copper vellon.
银币
再用铜币维隆来替代,实行贬值。
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国的兴衰
英语短文 
究 
精选 Checking a metal's purity was a tedious task-likely to hold up every business transaction, and even when the Lydians and their neighbours invented coinage, about a hundred years before Croesus, this problem still remained.
检验金属的纯度是项无聊的工作,几乎每次都得耽误贸易的进行。
克罗伊斯王登基前一百年左右,吕底亚人已发明了货币,但纯度问题仍无法解决。