The watershed's worst problem is nutrient pollution, which is caused by the overabundance of the nutrients, nitrogen and phosphorus.
The watershed's worst problem is nutrient pollution, which is caused by the overabundance of the nutrients, nitrogen and phosphorus.
分水岭面临更严重的问题，来自营养物的污染，这些营养物污染源自营养物质、氮和磷的过量排放。