One recently retired UN official said that one of Ban's biggest handicaps was his lack of fluency in English, which made it difficult for him to win over audiences in the US and elsewhere. "We have got him diction lessons and media training," the former official said. The diction lessons, sometimes as often as two  to three times a week, have helped, but not enough. "We advised him to make fewer television appearances. He is a hard sell."    




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http://www.theguardian.com/world/2010/jul/22/ban-ki-moon-secretary-general-un