Cui Tiankai, China's Ambassador to the U.S., talks to Liu Xin, host of The Point with LIU Xin, on the upcoming 40th anniversary of the establishment of China-U.S. diplomatic relations. Cui said he had never thought that the relationship between the two countries would always follow a straight line, but he was confident that in the long run, the common interests of the two peoples would prevail. #TradeFriction | CGTN