U.S. President Barack Obama (R) waves to the audience with First Lady Michelle Obama after delivering his farewell address in Chicago, Illinois, United States of America on Jan, 10, 2017. (Xinhua/Shen Ting)
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U.S. President Barack Obama (R) waves to the audience with First Lady Michelle Obama after delivering his farewell address in Chicago, Illinois, United States of America on Jan, 10, 2017. (Xinhua/Shen Ting)
