
Photo taken on Aug. 9, 2017 shows the historical site of Aihui Customs in Aihui Town in the Aihui District of Heihe City, northeast China's Heilongjiang Province, Aug. 9, 2017. Located along the Heilongjiang River, Aihui ancient town has a long history of over 300 years. (Xinhua/Wang Jianwei)