中国古代的车基本上都是双轮车。两轮间的距离谓之“轨”。车行驶时两轮在地面上压出的印迹称为“辙”。辙宽与轨宽是一样的,因此这两个词可以互用。从前老上海滩上行驶的“有轨电车”实际上准确地说应称为“有辙电车”才对,因为它的“轨”是凹陷下去的。连接两轮之木曰“轴”。轴横贯于两轮的毂中并出于毂外, Ancient Chinese cars are basically two-wheeled vehicles. The distance between two wheels means “track”. The two wheel prints on the ground when the car is driving are called “rut”. Rut width and rail width are the same, so these two words can be interoperable. Trams that once used to be on the beach are actually more accurately called “trams” because their “rails” are hollowed out. Connect two rounds of wood “shaft ”. The shaft traverses both hubs and out of hubs,