求翻译：It seems that as the years go by, we hear about so many crimes committed by youths. One memorable crime that comes to mind is the shooting at Columbine High School that happened on April 20, 1999 in Littleton, Colorado. Dylan Klebold and Eric Harris were associated with a group called the "trenchcoat" mafia. This group is made out of students that are an outcast from the school. When the shooting occurred, it was targeted to athletics. The athletics were popular and had great social influence at the school, which was one of the main reasons that the "trenchcoat" mafia hated. This is an example of youth gang and a horrific crime that they committed. 14 students and 1 teacher died from the shooting. It was clear that when Dylan and Eric planned for the shooting, they were going to kill all the athletics.是什么意思？

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