求翻译：高速公路是国家的基础设施，高速公路的开通能够加强商品货物的流通，加强区域经济的发展，拉动国民经济的增长。但是，高速公路是一项投资大、投资回收期长的基础设施项目。高速公路一旦建设投产后，高速公路的大部分成本为沉没成本，难以回收的项目成本。因此，为了实现高速公路的可持续性发展，总结经验，有必要进行高速公路效益后评价是什么意思？

The highway is the country's infrastructure, the opening of the highway to strengthen the flow of commodity goods, and to strengthen regional economic development, stimulating the growth of national economy. However, the highway is a large investment and long payback period of infrastructure project

The superhighway is a national infrastructure, superhighway's break through can strengthen the merchandise goods to circulate, strengthenning the development of the district economy, pulling the growth of move the national economy.But, the superhighway is the infrastructure item that an investment i

The highway is the national infrastructure, the highway clear can strengthen the commodity cargo the circulation, strengthens the region economy the development, draws the national economy the growth.But, the highway is one item in a big way invests, the investment recoupment period long infrastruct

Freeway is the country's infrastructure, highway opened to enhance the circulation of commodity goods, strengthen regional economic development, stimulating economic growth. However, the expressway is an investment in infrastructure projects, investment return period long. Once commissioned the cons

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