high five, 擊掌

U.S. President Barack Obama reaches up to high five a child upon his arrival in Pittsburgh, Pennsylvania July 21, 2015. Obama is in Pittsburgh to address the 116th National Convention of the Veterans of Foreign Wars. (REUTERS/Kevin Lamarque)
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Photos of the day - July 21, 2015
http://news.yahoo.com/photos/photos-of-the-day-july-21-2015-slideshow/photos-of-the-day-july-21-2015-photo-1437505218420.html