On January 1, 1979, China and the U.S. established diplomatic relations. 40 years on, bilateral relations have experienced enormous growth, despite ups and downs along the way. This year, we celebrate four decades of China-U.S. diplomacy. Cui Tiankai, Chinese Ambassador to the U.S., shares his own memory of the establishment of diplomatic relations between China and the U.S. during an interview with Liu Xin from CGTN.