Ping-Pong diplomacy was a classic episode in the diplomatic history of China and the U.S. Currently, China-U.S. relations are facing serious challenges. Some U.S. politicians have even called for boycotting the Beijing Winter Olympics. For more, CGTN reporter Cui Huiao talks with Professor Gao Zhikai, chair professor, of Soochow University. Gao talks about the significance of ping pong diplomacy.