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一、两个重要观念我国铁路建设的现实是：周期较长，资金短缺。因此，怎样用最少的投资，在最短的时间内，形成需要的运输能力？是一个值得研究的大课题。
First, two important concepts The reality of China’s railway construction is: a longer cycle, lack of funds. Therefore, how to use the least investment in the shortest possible time to form the necessary transport capacity? It is a big topic worth studying.