People lay flowers to pay tribute to revolutionary martyrs during a campaign at the Museum of the War of Chinese People's Resistance Against Japanese Aggression in Beijing, capital of China, April 4, 2019. China has kicked off a campaign to promote paying tribute to revolutionary martyrs as Tomb-sweeping Day draws near. The campaign is aimed at combining educational activities with paying tribute. Tomb-sweeping Day, also known as Qingming Festival, falls on April 5 this year. It is a traditional Chinese holiday where people pay tribute to deceased family and friends. (Xinhua/Zhang Chenlin)