Students and faculty members from Shanghai Jiao Tong University observe a moment of silence during a commemorative event held on the occasion of China's seventh Martyrs' Day in east China's Shanghai, Sept. 30, 2020. (Photo: Xinhua)

A commemorative event is held on the occasion of China's seventh Martyrs' Day at the Chinese People's Volunteers (CPV) martyrs' cemetery in Shenyang, northeast China's Liaoning Province, Sept. 30, 2020.

People line up to lay flowers during a commemorative event held on the occasion of China's seventh Martyrs' Day at the Geleshan Martyrs' Cemetery in southwest China's Chongqing Municipality, Sept. 30, 2020.

Primary school students attend a commemorative event held on the occasion of China's Seventh Martyrs' Day at Malong District Martyrs' Cemetery in Malong District of Qujing, southwest China's Yunnan Province, Sept. 30, 2020.

Students lay flowers during a commemorative event held on the occasion of China's seventh Martyrs' Day at Geleshan Martyrs' Cemetery in southwest China's Chongqing Municipality, Sept. 30, 2020.

A commemorative event is held on the occasion of China's seventh Martyrs' Day at Shanghai Jiao Tong University in east China's Shanghai, Sept. 30, 2020.

Participants observe a moment of silence during a commemorative event held on the occasion of China's seventh Martyrs' Day at the Chinese People's Volunteers (CPV) martyrs' cemetery in Shenyang, northeast China's Liaoning Province, Sept. 30, 2020.

A commemorative event is held on the occasion of China's seventh Martyrs' Day at Nanchang Revolutionary Martyrs' Cemetery in Nanchang, east China's Jiangxi Province, Sept. 30, 2020.

Police officers observe a moment of silence during a commemorative event held on the occasion of China's seventh Martyrs' Day at Nanchang Revolutionary Martyrs' Cemetery in Nanchang, east China's Jiangxi Province, Sept. 30, 2020.

A student attends a commemorative event held on the occasion of China's seventh Martyrs' Day at Geleshan Martyrs' Cemetery in southwest China's Chongqing Municipality, Sept. 30, 2020.

A commemorative event is held on the occasion of China's seventh Martyrs' Day at the Chinese People's Volunteers (CPV) martyrs' cemetery in Shenyang, northeast China's Liaoning Province, Sept. 30, 2020.

Primary school students line up to lay flowers during a commemorative event held on the occasion of China's Seventh Martyrs' Day at Malong District Martyrs' Cemetery in Malong District of Qujing, southwest China's Yunnan Province, Sept. 30, 2020.

Aerial photo taken on Sept. 30, 2020 shows a commemorative event held on the occasion of China's Seventh Martyrs' Day at Malong District Martyrs' Cemetery in Malong District of Qujing, southwest China's Yunnan Province.

People lay flowers during a commemorative event held on the occasion of China's seventh Martyrs' Day at the Geleshan Martyrs' Cemetery in southwest China's Chongqing Municipality, Sept. 30, 2020.

War veterans participate in a commemorative event held on the occasion of China's seventh Martyrs' Day at the Chinese People's Volunteers (CPV) martyrs' cemetery in Shenyang, northeast China's Liaoning Province, Sept. 30, 2020.

People observe a moment of silence during a commemorative event held on the occasion of China's seventh Martyrs' Day at Geleshan Martyrs' Cemetery in southwest China's Chongqing Municipality, Sept. 30, 2020.

A commemorative event is held on the occasion of China's seventh Martyrs' Day at the Chinese People's Volunteers (CPV) martyrs' cemetery in Shenyang, northeast China's Liaoning Province, Sept. 30, 2020.

A commemorative event is held on the occasion of China's seventh Martyrs' Day at the Chinese People's Volunteers (CPV) martyrs' cemetery in Shenyang, northeast China's Liaoning Province, Sept. 30, 2020.

A student lays flowers during a commemorative event held on the occasion of China's seventh Martyrs' Day at the Chinese People's Volunteers (CPV) martyrs' cemetery in Shenyang, northeast China's Liaoning Province, Sept. 30, 2020.

A commemorative event is held on the occasion of China's seventh Martyrs' Day at Nanchang Revolutionary Martyrs' Cemetery in Nanchang, east China's Jiangxi Province, Sept. 30, 2020.

Students and faculty members from Shanghai Jiao Tong University lay flowers during a commemorative event held on the occasion of China's seventh Martyrs' Day in east China's Shanghai, Sept. 30, 2020.