Travellers visit a science and technology hall in Yangchenghu service area along the Shanghai-Nanjing Expressway in Weiting Township of Suzhou, east China's Jiangsu Province, Aug. 8, 2019. Yangchenghu service area was put into use in May of 2019 after upgrading and rebuilding. Its distinctive interior design and friendly environment make here a popular rest place for travellers. (Xinhua/Ji Chunpeng)