Michelle Obama

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U.S. first lady Michelle Obama, center, dances with performers during her visit to an ancient city wall with her daughters Malia, second from left, and Sasha, right, in Xi'an, in northwestern China's Shaanxi province, Monday, March 24, 2014. (AP Photo/Alexander F. Yuan)

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U.S. first lady Michelle Obama, center, jumps rope with Chinese schoolchildren as she visits an ancient city wall with her daughters and her mother in Xi'an, in northwestern China's Shaanxi province, Monday, March 24, 2014. (AP Photo/Alexander F. Yuan)

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U.S. first lady Michelle Obama, center, checks a terracotta warrior as she visits Qinshihuang Terracotta Warriors and Horses Museum with her daughters, Malia, third right, and Sasha, fourth right, and her mother, Marian Shields Robinson, fourth left, in Xi'an, in northwestern China's Shaanxi province, Monday, March 24, 2014. (AP Photo/Alexander F. Yuan)