Through accurate depicting of railway’s historic changing, the recent"4-stage growth model" of railway freight demand positively verifies the progress stages of transportization once more.
铁路货运需求增长变化的四阶段模型通过准确刻划铁路的历史发展轨迹，从又一个角度验证了运输化有关阶段的演变过程。
参考来源 - 运输发展理论以运输化为主要线索的新进展·2,447,543篇论文数据，部分数据来源于NoteExpress
Paper establishes a regression prediction model to predict the company's freight demand from 2009 to 2013.
论文采用回归分析预测法建立了一元回归预测模型来预测公司近期2009年至2013年公司的货运需求。
However, the existing airports in primary cities, such as Beijing, Shanghai, and Guangzhou, are still not adequate to meet the ever-increasing passenger and freight demand.
但是在几个主要城市的机场，像北京，上海，广州仍不能满足日益增长的乘客和航班要求。
The main problem is a severe capacity constraint that does not allow the Railways to carry more freight even when there is demand.
主要问题在于严重的运能限制，因此即便有需求时，铁路也无法输送更多货物。
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