三西地区
三西地区-
宁夏南部山区是国家有名的三西贫困地区，严酷的自然环境和特殊的历史条件形成的城乡二元结构，造成了农村劳动力的大量剩余。
The south mountainous areas of Ningxia are famous for their poverty in China , their social structure is formed by the inclement natural environment and the special historical condition , thus labourers in the countryside are surplus greatly .
-
三西至华东地区煤炭调运问题的研究&运输模式（径路）的选择（三）T.东写西说（三）
Study on Transporting Coal From the 3 Western Districts of 3 Provinces Region to the East China the Selection of Transport Modal ( Route )