U.S. Secretary of State Hillary Clinton (R) watches Chinese President Hu Jintao (C) shake hands with U.S. Treasury Secretary Timothy Geithner after the opening ceremony of the U.S.-China Strategic and Economic Dialogue in Beijing on May 3, 2012. China and the United States need to learn how to trust each other, Chinese President Hu Jintao said at the start of the annual talks. UPI/Stephen Shaver