Aerial photo taken on July 28, 2018 shows the morning scenery of the Saihanba National Forest Park in Chengde, north China's Hebei Province. Saihanba is a vast forest covering nearly 75,000 hectares. It was a piece of barren land 55 years ago, but decades of hard afforestation efforts turned it into an important ecological shield for Beijing and Tianjin. (Xinhua/Liu Mancang)