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Chinese Vice Premier Zhang Gaoli poses for a group photo with guests at the opening ceremony of the 40th Antarctic Treaty Consultative Meeting (ATCM) in Beijing, capital of China, May 23, 2017. (Xinhua/Wang Ye)

Chinese Vice Premier Zhang Gaoli poses for a group photo with guests at the opening ceremony of the 40th Antarctic Treaty Consultative Meeting (ATCM) in Beijing, capital of China, May 23, 2017. (Xinhua/Wang Ye)