Photo taken on May 23, 2019 shows lotus flowers in 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.(Photo: Xinhua)

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.(Photo: Xinhua)

Tourists visit a botanical garden in north China's Tianjin Economic-Technological Development Area (TEDA), May 23, 2019. 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. (Photo: Xinhua)

A staff member waters flowers in a botanical garden in north China's Tianjin Economic-Technological Development Area (TEDA), May 23, 2019. 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. (Photo: Xinhua)

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.(Photo: Xinhua)
 

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.(Photo: Xinhua)