People pay a silent tribute to martyrs who died in the fight against the novel coronavirus disease (COVID-19) outbreak and compatriots who died of the disease in Wuhan, central China's Hubei Province, April 4, 2020. (Xinhua/Xiao Yijiu)

Medical workers pay a silent tribute to martyrs who died in the fight against the novel coronavirus disease (COVID-19) outbreak and compatriots who died of the disease in Wuhan, central China's Hubei Province, April 4, 2020. (Xinhua/Cai Yang)

A medical worker pays a silent tribute to martyrs who died in the fight against the novel coronavirus disease (COVID-19) outbreak and compatriots who died of the disease in Wuhan, central China's Hubei Province, April 4, 2020. (Xinhua/Cai Yang)

A student pays a silent tribute to martyrs who died in the fight against the novel coronavirus disease (COVID-19) outbreak and compatriots who died of the disease in Feixi, east China's Anhui Province, April 4, 2020. (Xinhua/Liu Junxi)

People pay a silent tribute to martyrs who died in the fight against the novel coronavirus disease (COVID-19) outbreak and compatriots who died of the disease in Feixi, east China's Anhui Province, April 4, 2020. (Xinhua/Liu Junxi)