Wang Naiyan, academician of the Chinese Academy of Sciences, makes a report at a seminar commemorating the 50th anniversary of the success in the country's first atomic bomb, in Beijing, China, Sept. 18, 2014. (Xinhua/Li Xin)

Du Xiangwan, academician of the Chinese Academy of Engineering, makes a report at a seminar commemorating the 50th anniversary of the success in the country's first atomic bomb, in Beijing, China, Sept. 18, 2014. (Xinhua/Li Xin)

Hu Side, academician of the Chinese Academy of Engineering, makes a report at a seminar commemorating the 50th anniversary of the success in the country's first atomic bomb, in Beijing, China, Sept. 18, 2014. (Xinhua/Li Xin)

A seminar is held to commemorate the 50th anniversary of the success in the country's first atomic bomb, in Beijing, China, Sept. 18, 2014. (Xinhua/Li Xin)

Li Guanxing, chairman of the board of directors of the Chinese Nuclear Society, speaks at a seminar commemorating the 50th anniversary of the success in the country's first atomic bomb, in Beijing, China, Sept. 18, 2014. (Xinhua/Li Xin)

Zhang Qin, vice president of the China Association for Science and Technology, speaks at a seminar commemorating the 50th anniversary of the success in the country's first atomic bomb, in Beijing, China, Sept. 18, 2014. (Xinhua/Li Xin)