A pair of twins, Wang Jiabin (R) and Wang Jiawen play on the T3089 train from Hefei, east China's Anhui Province, to Guangzhou, south China's Guangdong Province, on Feb. 12, 2019. The pair of twins, accompanied by their parents, leave their hometown for Guangzhou, the city where their parents work. As the Spring Festival holiday ended, people flocked back to cities where they work. (Xinhua/Zhang Duan)