阅读下面的短文，根据其内容写一篇60词左右的内容概要。 Thefamiliar yellow school bus is the largest system of mass transportation in theUS and every school day transports roughly 25 million young people to schooland home again after the school day ends. Meanwhile, they are the safest methodfor getting kids to and from school, according to the National Highway TrafficSafety Administration (NHTSA). Children are 70 times more likely to arrive atschool safely on the school bus than if they had traveled to school drivingthemselves or riding with friends. Theseschool buses mee