(210128) -- NANJING, Jan. 28, 2021 (Xinhua) -- Passengers wait for trains at Nanjing South Railway Station in Nanjing, east China's Jiangsu Province, Jan. 28, 2021. The Spring Festival travel rush, known as the world's largest annual human migration, lasts 40 days from Jan. 28 to March 8 this year. (Xinhua/Ji Chunpeng)
