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Virginia Tech students sign a book in memory of those killed on the campus of Virginia Tech in Blacksburg, Virginia, April 17, 2007. A student from South Korea was the gunman who killed 32 people at Virginia Tech university, police said on Tuesday. They gave no motive for the worst shooting rampage in U.S. history. (Reuters)

（英語(yǔ)點(diǎn)津 Annabel 編輯）