A worker maintains an unmanned retail car in Xiong'an, north China's Hebei Province, Dec. 10, 2019. "Unmanned" technologies have brought great convenience to the city life in Xiong'an. (Xinhua/Xing Guangli)

A customer pays by scanning face at a self-service supermarket in Xiong'an, north China's Hebei Province, Dec. 10, 2019. "Unmanned" technologies have brought great convenience to the city life in Xiong'an. (Xinhua/Yin Gang)

A customer registers at a self-service supermarket in Xiong'an, north China's Hebei Province, Dec. 10, 2019. "Unmanned" technologies have brought great convenience to the city life in Xiong'an. (Xinhua/Yin Gang)

A staff member shows how to check in by scanning face at a hotel in Xiong'an, north China's Hebei Province, Dec. 10, 2019. "Unmanned" technologies have brought great convenience to the city life in Xiong'an. (Xinhua/Yin Gang)

A worker cleans snow covered on a driverless bus in Xiong'an, north China's Hebei Province, Dec. 10, 2019. "Unmanned" technologies have brought great convenience to the city life in Xiong'an. (Xinhua/Xing Guangli)

A worker maintains a driverless bus in Xiong'an, north China's Hebei Province, Dec. 10, 2019. "Unmanned" technologies have brought great convenience to the city life in Xiong'an. (Xinhua/Xing Guangli)

People select goods at a self-service supermarket in Xiong'an, north China's Hebei Province, Dec. 10, 2019. "Unmanned" technologies have brought great convenience to the city life in Xiong'an. (Xinhua/Yin Gang)

A worker tests a driverless bus in Xiong'an, north China's Hebei Province, Dec. 10, 2019. "Unmanned" technologies have brought great convenience to the city life in Xiong'an. (Xinhua/Xing Guangli)