跪求美国校车的英文介绍，急用 大概150到200个词吧..谢谢..

In the United States, school buses provide an estimated 10 billion student trips every year. Every school day, over 480,000 school buses transport 26 million children to and from schools and school-related activities; over half of the country's student population is transported by school bus.School buses are leased or purchased by school districts, while other school districts use school bus contractors to transport students. In the United States, approximately 40% of school districts use contractors to handle student transportation; in Canada, they are used almost universally.