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钱，也就是货币。在钱的发展的历史中，它以实物货币、金属货币、纸币、电子货币等等的形式出现。 Money is money. In the history of the development of money, it appears in the form of physical currency, metal currency, paper currency, electronic currency and so on. 钱的昨天就是一些实物货币、金属货币。实物货币就是一些古希腊时的牛和羊、非洲和印度的象牙、美洲土着人和墨西哥人的可可豆这一类的东西。而这些实物货币对人类来说，很不方便也很不安全。所以很快就被淘汰了。接着就产生了金属货币。金属货币最初是由铜等低价的金属充当的，后来就逐渐固定在金银上。我国的古铜币有刀币、布币、铲币、环钱等。虽然金属货币比起实物货币要方便些，但还是有点笨重了，而且也不够安全，所以不久后也被淘汰了。 Yesterday's money was some real money, metal money. The real currency is something like cattle and sheep of ancient Greece, ivory of Africa and India, cocoa of Native Americans and Mexicans. These real currencies are inconvenient and unsafe for human beings. So it was eliminated soon. Then came metal money. Metal money was initially made of low-priced metals such as copper, and later gradually fixed on gold and silver. China's ancient copper coins include knife coins, cloth coins, shovel coins and ring coins. Although metal currency is more convenient than real currency, it is a bit cumbersome and unsafe, so it was eliminated soon. | 
