People attend a campaign to pay tribute to revolutionary martyrs 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)