The relationship between urbanization and air qualities in the Northwest region of China is studied.
以西北地区省会城市为研究对象，研究西北地区城市化与空气质量之间的关系。
Northwest region of China is a certain region that has many nationalities and most complicated national relation.
中国西北地区是民族较多、民族关系最为复杂的一个地区。
Good thermal property and structural quality of loess in northwest region of China makes cave-dwelling local folk house.
中国西北地区的黄土具有良好的热工特性和结构特性。
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