这次交通堵塞从8月13号开始，是由于道路施工减少高速公路流量引起的。 这条高速公路是一条运输主干线，中国西北的运煤和其他货物的货车从这里进入北京。
The mess began August 13th when road works cut capacity on the main artery for coal and other freight traffic from north-western China into the capital.
在介绍国内内河班轮运输状况的同时，对长江干线航道状况分段进行分析介绍。
With the introduction of domestic freshwater liner shipping, the shipping channel status of Yangtzi's mainline is showed.
后来他们靠近干线及公共运输站且在城市里，通常都是层层叠叠向高空垂直的（高层建筑）。
Since they were near main and public transit stations and in cities, they tended to be vertically organized with rooms stacked upon rooms raising high into the sky.
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