求翻译：This is an important historical development, representing the extension of gang behavior and gang culture into new regions of the country and with new styles. While the gangs may have begun in imitation of such gangs as the Crips and Bloods, and may still wear typical gang clothing and paraphernalia, they are more of an organization of those youth who are prone to violence and delinquent behavior than they are instances of ethnic turf battles. Again, another movie might be helpful in thinking about these kinds of gangs. The movie Grease portrayed a certain class of young teen-agers who had clothing, culture, and behaviors in common. Yet, they were not seen as youth gangs, but as a faction or clique within the overall high school environment. In 1999, however, these greasers are more likely to be organized into youth gangs of the type identified in Puyallup. They have borrowed some of the behavior and culture from the urban gangs, become more organized, and engaged in more conflict between groups. They tend to harass and intimidate the other students.是什么意思？

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