XINING, Dec. 15 (Xinhua) -- Residents in the city of Yushu are familiar with a sweet melody that is played every day at dawn. Many might not be aware of the Disneyland song `It`s a Small World,` but when the sound begins, they know a garbage truck will appear. Garbage trucks are new to the locals, so are waste treatment plant, sanitation workers, sewage treatment and heating system in this city on the Qinghai-Tibet Plateau, with an altitude of 4,500 meters above sea level. Located in the Tibetan Autonomous Prefecture of Yushu in northwest China`s Qinghai Province, Yushu has a population of over 111,000, and nearly 95 percent of them are ethnic Tibetans. On April 14, 2010, a magnitude-7.1...
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