各个朝代的铜钱,无论大小,中间都有一个方形的孔,因此钱就有了“孔方兄”的雅号。这个方孔,并不是为了美观而进行的设计,而是为了适应铜钱的制作方法。铜钱是采用融化金属,然后在模子里铸成的。这样,铜钱的边缘会出现凝固的多余金属,而不整齐。为了将边缘修齐,就要用工具打磨。而一枚一枚 The coins of every dynasty, no matter their size, have a square hole in the middle, so the money has the nickname “Kong Fangxiong”. This square hole, not for aesthetic design, but to adapt to the method of making copper coins. The coins are made of molten metal and then cast in molds. In this way, the solidified excess metal appears on the edge of the coin, which is not regular. In order to repair the edge together, it is necessary to use tools polished. And one by one