求翻译：　　学生方面，美国有许多校车相关的政府或公益团体，凭借各自的努力推动校车在美国的进一步普及并积极开展活动从各方面教导学生相关的安全知识。比如美国学生交通联盟就每年有一个以校车为主题的绘画大赛，并从中评选出优秀作品。在这些团体网站上还有许多面向学生的内容，比如说通过小游戏让学生清楚地了解到校车的盲区位置。总之，经过这么多年的发展，美国校车已经形成了一个成熟的产业，并具备了健全的管理制度和普及制度，维系着每天2500万名学生的上学和放学安全。是什么意思？

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Students in the United States there are many school bus related government or public interest groups, and rely on their own efforts to promote school buses in the United States further universal and are active in all aspects related to the teaching the students safety knowledge. For example, the Uni

　　The student aspect, US has many school bus correlation government or the public welfare association, relies on respective diligently impetus school bus further popular and carries out the activity in US from various aspects to teach positively the student is connected security knowledge.For instan

　　Students, United States Government or with many school bus-related public interest groups, by virtue of their respective efforts to promote school buses in the United States further popularization and active in all aspects of teaching students the relevant security knowledge. Such as the United St