Newly-elected academician of the Chinese Academy of Sciences (CAS) Duan Guangren speaks during a symposium in Beijing, capital of China, Nov. 22, 2019. (Xinhua/Cai Yang)

　　Bai Chunli (Central R), president of the Chinese Academy of Sciences (CAS), presents the academician certificate to newly-elected academician Zhang Jiping (Central L) during a symposium in Beijing, capital of China, Nov. 22, 2019. (Xinhua/Cai Yang)

　　Bai Chunli (Central R), president of the Chinese Academy of Sciences (CAS), presents the academician certificate to newly-elected academician Gao Yuanning (Central L) during a symposium in Beijing, capital of China, Nov. 22, 2019. (Xinhua/Cai Yang)

　　Bai Chunli (Central R), president of the Chinese Academy of Sciences (CAS), presents the academician certificate to newly-elected academician Chang Kai (Central L) during a symposium in Beijing, capital of China, Nov. 22, 2019. (Xinhua/Cai Yang)

　　A symposium for newly-elected academicians of the Chinese Academy of Sciences (CAS) is held in Beijing, capital of China, Nov. 22, 2019. (Xinhua/Cai Yang)