upstream region造句怎么写

Back-assessment of socio-economic effect for ecological construction in upstream region of Heihe river;

A GIS-based research on geomorphological configurationfeatures of the upstream region of Minjiang River

The Jiuzhaigou Reserve belongs to the upstream drainage basin of a branch of Yangtze River, which is a typical upstream region of Yangtze River with landscape attractions (especially water scene) and primeval ecological tourism attractions.