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.