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But there are things the drone cannot see. On Sunday, Gao's team climbed for two hours to the middle of the slope to make sure large boulders there were stable.
By Sept 7, the average price of praseodymium-neodymium oxide, the iconic rare earth product, rose to 520,000 yuan (,280) per metric ton, a 6.1 percent increase over the price only a week ago, and double the price at this time last year, according to Baiinfo.com, a raw material information provider.
By 2020, China is expected to see 200 new general aviation airports, bringing the country's total to around 500. The figure is expected to reach around 2,000 by 2030.
By 2020, China plans to expand the total mileage of the nation's railways in operation to 150,000 km, covering most cities with a population larger than 200,000.
But the fate of items taken from the Summer Palace is also subject to existing conventions, and China has little or no legal claim to them in the countries where they ended up, many experts said.
来源：资阳报