XINING, March 24 (Xinhua) -- As spring ice melts along the upper reaches of the Lancang River in northwest China's Qinghai Province, 37-year-old ranger Chozin sets out on his patrol. Clad in full gear and holding binoculars, he carefully monitors the water source, a routine he has followed for years.
"The river flows into other countries," he often tells his children. "If the source is healthy, the downstream wi
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