Xinhua Headlines: 40 years on, only by cooperation can China, U.S. cope with perplexities in ties

This undated file photo shows visitors looking to buy stuffed panda toys in Atlanta, the United States, as two giant panda cubs from China's Sichuan Province, Jiu Jiu and Hua Hua, start their lives in a zoo of the city. (Xinhua/Wang Yan)