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Chinese expert Zhou Xi'an (L) works at Ta Keo Temple, part of the complex of Angkor Archaeological Park, in Siem Reap, Cambodia, on July 9, 2018. (Xinhua/Mao Pengfei)

Chinese expert Zhou Xi'an (L) works at Ta Keo Temple, part of the complex of Angkor Archaeological Park, in Siem Reap, Cambodia, on July 9, 2018. (Xinhua/Mao Pengfei)