People visit a photo exhibition in Geneva, Switzerland, on June 22, 2017. The photo exhibition was held here Thursday to celebrate the 20th anniversary of Hong Kong's return to China. (Xinhua/Xu Jinquan)
People visit a photo exhibition in Geneva, Switzerland, on June 22, 2017. The photo exhibition was held here Thursday to celebrate the 20th anniversary of Hong Kong's return to China. (Xinhua/Xu Jinquan)