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。

youdao

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。

youdao