LANZHOU, Jan. 13 (Xinhua) -- At a training center in Baiyin, a city in northwest China's Gansu Province, Li Yanrong intently watches a computer screen as he guides a virtual drone through takeoff, hovering, cruising and landing, all under the careful supervision of his instructor.
The sophomore at a local vocational mining college has invested 8,000 yuan (about 1,140 U.S. dollars) of his savings into a
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