Tourists can use the colour-coded map to guide themselves on walks of the city.游客可以利用这张标有色标的地图作指引，寻找城里的旅游路线。The map is colour-coded and easy to follow.这张地图有色标，很容易看懂。Return envelopes were colour-coded with red trim for Kansas, green for Ohio.堪萨斯州的回件信封标上红边，俄亥俄州的回件信封标上绿边。