Tourists visit the Tianjin Garden during the "Tianjin Day" theme event at the Beijing International Horticultural Exhibition in Yanqing District, Beijing, capital of China, May 5, 2019. May 5 marks the opening of "Tianjin Day" theme event at the Beijing International Horticultural Exhibition in Beijing. The city strengthened ecological and wetland protection under the theme of "eco-friendly Tianjin, green development." (Xinhua/Ju Huanzong)