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Photo taken on Jan. 20, 2020 shows a drilling machinery exhibited during the 37th annual Mineral Exploration Roundup at the Vancouver Convention Centre in Vancouver, Canada. (Photo by Liang Sen/Xinhua)
Photo taken on Jan. 20, 2020 shows a drilling machinery exhibited during the 37th annual Mineral Exploration Roundup at the Vancouver Convention Centre in Vancouver, Canada. (Photo by Liang Sen/Xinhua)