泾河流域马莲河分流域，年降雨量表现为不变或微弱下降；

However, precipitation in Malian river sub-watershed remains no change or drops weekly;

youdao

泾河流域马莲河分流域，年降雨量表现为不变或微弱下降；

However, precipitation in Malian river sub-watershed remains no change or drops weekly;

youdao