This was after the columbine high school shootings in colorado .
这是在科罗拉多州哥伦拜恩中学枪击案之后。
Ever since the shootings at columbine high school , in a denver suburb , in 1999 , american schools have been preparing for gunmen .
自从1999年丹佛郊外的哥伦拜恩中学发生枪击案后，美国各个学校都采取了防范枪手的措施。
In recent years , despite periodic spasms of attention after mass killings like those at columbine and virginia tech , gun control has made no headway at the federal level either .
In the late morning of april 20th 1999 a pair of teenagers , dylan klebold and eric harris , walked into the cafeteria at columbine high school in colorado and began gunning down their classmates .
