Pupils visit a memorial hall in honour of Zuo Quan, a military commander of the army led by the Communist Party of China (CPC), at a revolutionary martyrs' cemetery in Handan, north China's Hebei Province, April 3, 2019. Activities in honour of revolutionary martyrs are held across China ahead of the Qingming Festival, or Tomb-sweeping Day, which falls on April 5 this year. (Xinhua/Wang Xiao)