President of the Chinese Academy of Sciences (CAS) Bai Chunli (R) and President of the Serbian Academy of Sciences and Arts (SANU) Vladimir S. Kostic sign a cooperation agreement between CAS and SANU in Belgrade, Serbia, March 27, 2019. CAS and SANU on Wednesday signed a cooperation agreement which will enable them to exchange young scientists and experts and strengthen academic cooperation between China and Serbia. (Xinhua/Shi Zhongyu)