Chinese President Xi Jinping (2nd L) and his wife Peng Liyuan (3rd R), accompanied by Denis Sassou Nguesso, the president of the Republic of Congo, and his wife Antoinette, communicate with Chinese-learning students and teachers when attending the inauguration ceremony of the library of the Marien Ngouabi University as well as its China Reading Room in Brazzaville, capital of the Republic of Congo, March 30, 2013. [Xinhua]