A friendship match is held at the headquarters of theUnited Nationsin commemoration of the China-US Ping-Pang diplomacy, 45 years after the Chinese Ping-Pang delegation came to the UN for the first time, in New York Sept. 15, 2017. In 1971 and 1972, US and Chinese table tennis teams exchanged visit after many years of estrangement and antagonism between the two countries, opening the door for the China-US people-to-people contact. (Xinhua/Li Muzi)