1. 铜币主要是铜贝,椭圆形,背面平,正面凸起,有文字,字形像蚂蚁,两口像鼻孔,故称蚁鼻钱。 Copper is mainly copper shell, oval-shaped, flat on the back of the front convex, with text, font, like ants, like the two nostrils, so that ants nose money.