A self-driving sweeper car is put into service at Inner Mongolia Normal University in Hohhot, north China's Inner Mongolia Autonomous Region, Jan. 9, 2019. (Xinhua/Ding Genhou)
Snow scenery of Washington D.C.
Frosty scenery seen in Tianjin
In pics: Tibetan gazelles on grassland in China's Qinghai
Rime scenery in Yuncheng City, north China's Shanxi
Tibet to strengthen railway construction in 2019
In pics: traditional hand-built shipyard in Shandong