U.S. mass shootings, 美國重大槍擊案

In this July 23, 2012 file photo, movie theater massacre defendant James Holmes sits during a pre-trial hearing in Arapahoe County District Court in Centennial, Colo. (RJ Sangosti/The Denver Post via AP, Pool)
U.S. mass shootings: 'The dark side of American exceptionalism'
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