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最早的货币没有人知道人类最早是什么时候开始使用诸如贝壳、石头和动物骨头作为货币的。但最早的金属货币是曾在美索不达米亚流通的小铜片。最早的硬币则来自位于小亚细亚西部的富裕古国吕底亚(现在的土耳其),由金银合金制成:这种用于制造硬币的金属在经过加热之后,会变得更易铸造(就是很容易改变形状),你只需要将其放在两个冲模中间,用锤子反复击打就成了。由于在冲模上雕刻有不同的符号和图案,所以硬币也就有了相应的图案。对了,纯金和纯银的硬币也同样诞生于吕底亚,是由克洛伊索斯国王在公元前561年发明的。时至今日,大部分的硬币仍是由不同种类的金属制成的,比如铁、镍和锌。如何知道某种硬币的材质呢?在下面的实验中找答案吧。
No Earliest Currency No one knows when human beings first began to use such things as shells, stones and animal bones as their currency. But the earliest metal currency was a small piece of copper that circulated in Mesopotamia. The earliest coins came from the wealthy ancient Lydia (now Turkey) in western Asia Minor, made of a gold-silver alloy: the metal used to make coins becomes more easily cast (that is, easily changed Shape), you just have to put it in the middle of two punches and you have to hit it repeatedly with a hammer. Because of the different symbols and patterns engraved on the die, so the coin will have the corresponding pattern. By the way, coins of pure gold and sterling silver were also born in Lydian, which was invented by King Criuksau in 561 BC. To date, most of the coins are still made of different kinds of metals, such as iron, nickel and zinc. How to know the material of a coin? Find answers in the following experiment.