Passengers walk to board their train at Nanjing South Railway Station in Nanjing, east China's Jiangsu Province, Jan. 28, 2021. China kicked off its annual travel rush, known as "chunyun," on Thursday, with hundreds of millions starting to head home for the Spring Festival that falls on Feb. 12 this year. Known as the world's largest annual human migration, the travel rush lasts 40 days from Jan. 28 to March 8 this year. (Xinhua/Ji Chunpeng)
