求翻译：Los Angeles has often been referred to as "The Gang Capital of the Nation." In this seminar, we will explore the history of gangs in Los Angeles and its implications today. We will trace the changes in gang culture from its emergence in the 1960s until now. This seminar will also examine the role of ethnicity in gangs. We will touch upon the demographics of Los Angeles residents in relation to gangs as well as socioeconomic trends.是什么意思？

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