到这个世纪末，已经建成了一个巨大的道路网络，有居民街道、公路和高速公路，这些都是为了承受数百万的车流量而修建的。
By the end of the century, there was an immense network of paved roads, residential streets, expressways, and freeways built to support millions of vehicles.
虽然在一些领域走向滑坡，它所涉足的领域依旧很广，从制造潜艇到修建道路都有所涉猎。
Although it has slimmed down in some areas, its activities are still very diverse, from making submarines to building roads.
为了解决上述问题，有关部门应进行以下步骤：修建更多的道路，公路或铁路和增加公共汽车或火车到原来的线。
To solve the above-mentioned problems, the departments concerned should carry out the following steps: to build more roads, highways or railways and to add buses or trains to the original lines.
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