Black swans are seen in the Summer Palace in Beijing, capital of China, April 24, 2019. (Xinhua/Zhang Haofu)
China conducts joint naval exercise with Southeast Asian countries in Qingdao
In pics: azalea flowers on Gaomu Mountain in E China's Zhejiang
Blooming tulips seen in Istanbul, Turkey
In pics: naval parade marking 70th founding anniversary of PLA Navy
Scenery of advection fog in Danzhai County, SW China
"Flower blanket" seen in front of headquarters of World Health Organization
In pics: tulips in Tianjin, N China
In pics: apricot trees in full bloom in Harbin, NE China's Heilongjiang