Descendents of Chen Zigang, a Red Army martyr, visits his tomb at a cemetery for martyrs from Sichuan-Shaanxi Revolutionary Base in Tongjiang, Sichuan province, April 3, 2021. [Photo/Xinhua]

Wei Tieliang, keeper of a memorial hall dedicated to martyrs who died in the war against Japanese aggression, salutes to the memorial tablets of martyrs in Changyi, Shandong province, April 2, 2021. [Photo/Xinhua]

A resident pays tribute to martyrs at a monument dedicated to air force martyrs who died in resisting Japanese aggression in Nanjing, Jiangsu province, April 2, 2021. [Photo/Xinhua]

A student pays tribute to martyrs at a square dedicated to air force martyrs who died resisting Japanese aggression in Nanjing, Jiangsu province, April 2, 2021. [Photo/Xinhua]

Students from Ningxia Medical University pay tribute to heroes, martyrs and organ doners in Yinchuan, Ningxia Hui autonomous region, April 2, 2021. [Photo/Xinhua]

Students from Ningxia Medical University read a handout on body and organ donation in Yinchuan, Ningxia Hui autonomous region, April 2, 2021. [Photo/Xinhua]

Pupils from a primary school pay tribute to martyrs in Feixi, Anhui province, April 2, 2021. [Photo/Xinhua]

Pupils from a primary school pay tribute to martyrs in Huaibei, Anhui province, April 1, 2021. [Photo/Xinhua]