帮我润色这段话：The Lhasa River located between 29°20-30°15 north latitude and 90°05-91°09 east longitude is one of the largest tributaries of the Yarlung Tsangpo River in the middle reaches It has a total le

The Lhasa River, situated between 29°20'-30°15' north latitude and 90°05'-91°09' east longitude, is a significant tributary of the Yarlung Tsangpo River in the middle reaches. Spanning 568 km in total, the river has a highest altitude of around 5200 meters and a lowest altitude of 3580 meters. The average water temperature is 7.5 degrees Celsius. Snow water and rainfall are the primary sources of water for the river, and the rainy season lasts from mid-June to mid-September annually. The human settlements are mainly located in the lower reaches of the Lhasa River, where several ponds and wetlands can be found. In light of the higher likelihood of biological invasion in this area, the sampling points are mainly situated downstream.