Photo taken with a mobile phone shows a bee collecting honey at Xiangshan Park in Beijing, capital of China, March 13, 2019. (Xinhua/Yin Dongxun)

　　Photo taken with a mobile phone shows a bee collecting honey at Xiangshan Park in Beijing, capital of China, March 13, 2019. (Xinhua/Yin Dongxun)

　　Photo taken with a mobile phone shows a bee collecting honey at Weiying Hutong in Beijing, capital of China, March 14, 2019. (Xinhua/Ding Hongfa)

　　Photo taken with a mobile phone shows blossoming flowers at Weiying Hutong in Beijing, capital of China, March 14, 2019. (Xinhua/Ding Hongfa)