Aerial photo taken on May 22, 2019 shows a botanical garden in north China's Tianjin Economic-Technological Development Area (TEDA). Nearly ten years of greening efforts have successfully transformed a saline-alkaline marsh into a botanical garden with over 6,000 species of plants. The garden now serves as a plant resource bank in TEDA for scientific research, scientific education, demonstration and entertainment purposes. (Xinhua/Yue Yuewei)