(130131) -- WASHINGTON D.C., Jan. 31, 2013 (Xinhua) -- A staff watches as outgoing U.S. Secretary of State Hillary Clinton delivers her final address as Secretary of State on American leadership in Washington D.C., capital of the United States, Jan. 31, 2013. Hillary Clinton will be replaced by John Kerry as Secretary of State on February 1, 2013. (Xinhua/Zhang Jun)
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