Liu Yunshan, a member of the Standing Committee of the Political Bureau of the Communist Party of China Central Committee, meets with Cambodia's acting head of state and Senate President Samdech Say Chhum in Phnom Penh, Cambodia, Sept. 19, 2017. Liu paid an official visit to Cambodia from Sept. 19 to 21. [Photo/Xinhua]

Liu Yunshan (R), a member of the Standing Committee of the Political Bureau of the Communist Party of China Central Committee, meets with the governor of Preah Sihanouk province, in Preah Sihanouk province, Cambodia, Sept. 20, 2017. Liu paid an official visit to Cambodia from Sept. 19 to 21. [Photo/Xinhua]

Liu Yunshan, a member of the Standing Committee of the Political Bureau of the Communist Party of China Central Committee, visits a special economic zone jointly developed by China and Cambodia in Preah Sihanouk province, Cambodia, Sept. 21, 2017. Liu paid an official visit to Cambodia from Sept. 19 to 21. [Photo/Xinhua]

Liu Yunshan, a member of the Standing Committee of the Political Bureau of the Communist Party of China Central Committee, gives school supplies as presents to student representatives at an inauguration ceremony of five China-Cambodia friendship schools, in Preah Sihanouk province, Cambodia, Sept. 21, 2017. Liu paid an official visit to Cambodia from Sept. 19 to 21. [Photo/Xinhua]