
Tourists take an 800-meter-long automatic escalator at Central in Hong Kong, south China, May 30, 2017. July 1, 2017 marks the 20th anniversary of Hong Kong's return to the motherland. (Xinhua/Li Peng)

Tourists take an 800-meter-long automatic escalator at Central in Hong Kong, south China, May 30, 2017. July 1, 2017 marks the 20th anniversary of Hong Kong's return to the motherland. (Xinhua/Li Peng)