Members of a children's chorus perform during the opening ceremony of the 22nd Mandarin popularization week in east China's Shanghai, Sept. 16, 2019. The 22nd Mandarin popularization week is held from Sept. 16 to 22 across China, highlighting a myriad of Mandarin-speaking and writing activities, according to the Ministry of Education. Focusing on promoting Mandarin and carrying forward China's fine traditional culture, this year's event starts in Shanghai and concludes in the city of Kaili in southwest China's Guizhou Province, the ministry said. (Photo by Wang Xiang/Xinhua)