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Chinese Ambassador to Japan Kong Xuanyou addresses a reception celebrating the 20th anniversary of Macao's return to the motherland in Tokyo, Japan, Dec. 16, 2019. (Xinhua/Jiang Qiaomei)

Chinese Ambassador to Japan Kong Xuanyou addresses a reception celebrating the 20th anniversary of Macao's return to the motherland in Tokyo, Japan, Dec. 16, 2019. (Xinhua/Jiang Qiaomei)