Photo taken on Mar. 1, 2021 shows staff from China Railway Construction Corporation conducted unloading work at construction site of Subway Line 2 in Kunming, south China's Yunnan Province. The city is speeding up the construction of subway and fully resumed the work of major construction projects. (Tan Shuai/Guangming Picture)

Photo taken on Mar. 1, 2021 shows staff from China Railway Construction Corporation conducted unloading work at construction site of Subway Line 2 in Kunming, south China's Yunnan Province. The city is speeding up the construction of subway and fully resumed the work of major construction projects. (Tan Shuai/Guangming Picture)

Photo taken on Mar. 1, 2021 shows staff from China Railway Construction Corporation conducted unloading work at construction site of Subway Line 2 in Kunming, south China's Yunnan Province. The city is speeding up the construction of subway and fully resumed the work of major construction projects. (Tan Shuai/Guangming Picture)

Photo taken on Mar. 1, 2021 shows staff from China Railway Construction Corporation conducted unloading work at construction site of Subway Line 2 in Kunming, south China's Yunnan Province. The city is speeding up the construction of subway and fully resumed the work of major construction projects. (Tan Shuai/Guangming Picture)

来源：GMW.cn