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中国古代流通的货币——铜钱,中间为何有个方孔呢?有人说是为了便于穿绳成串好携带;有人说是为了节约金属;还有说是为了减轻铜钱的重量。其实,铜钱中间有方孔是由当时工艺条件所决定。
What is the reason why there is a square hole in the middle of ancient Chinese currency - copper coins? Some people say that it is a good way to put on strings for carrying; some say it is to save metal; and another is to reduce the weight of coins. In fact, the square hole in the middle of the coin is determined by the conditions at that time.