This paper analyzes the problem of water shortage in northwest regions of China, and proposes that natural change is the main reason that causes the meteorological drought;

对西北地区缺水问题进行了分析，认为西北地区的气候干旱主要是自然变迁造成的；

youdao

A line that lies in northwest region of China divided the state into different economic regions: agricultural economic region and nomadic economic region.

一条农牧分界线绵延于中国西北地区，由这里将中国分隔成两个不同的经济区域：农耕经济区与游牧经济区。

youdao

This paper summarized hydrological characters, distribution of precipitation and runoff in arid and semiarid regions in the northwest of China on the basis of the previous researches.

本文在前人研究基础上，总结了中国西北部干旱半干旱地区的水文特性，降水及径流的时空分布规律。

youdao