主要交通线 meaning in Chinese

highway

In chapter 2 , the conception of city belt was annotated , and it is especially point out that wanjiang city belt is not a city organic colony in really economy meaning , which is only a city denseness belt constituted by cities distributed along the main traffic line
同时，对城镇带的概念进行诠释，特别指出皖江城镇带还不是真正经济意义上的城镇有机群体，而仅仅是地域上城镇沿主要交通线呈带状分布且相对比较集中的一个城镇密集带。