求翻译：美国校车的顶部都加厚，防止在事故中校车翻滚造成车内孩子的受伤加剧，校车的整体架构都是严格符合安全性能设计标准的，一般都采用极厚的钢板，同时校车也都装配刹车减速装置，因此校车被称为“客车的设施，卡车的骨架”。是什么意思？

U.S. school bus at the top are thick, to prevent vehicle rollover in an accident caused by vehicle Lieutenant Colonel child's injuries increased, the overall structure of the school bus are in strict compliance with safety design standards, generally using a very thick steel plate, while the school

The top is thicker, the American school bus accident prevention in the school bus in the car rolling children caused the injury, and increased the overall framework for school bus is strict compliance with safety performance design standards, and are generally used very thick steel plate, and at the

The American school bus crown all adds thick, prevented the school bus tumbling creates in the vehicle in the accident the child to be injured the aggravating, the school bus overall construction all conforms to the safety performance design standard strictly, all uses the extremely thick steel plat

United States top school bus is thickened, prevent car accident Commander car roll child's injuries increase school bus the whole structure are strictly comply with safety design standards, usually very thick steel plates, while school bus assembled braking deceleration devices, so school bus called

United States school bus is at the top of thickened, prevent accident Lieutenant Colonel car rolls resulted in children injured in the car, the overall structure of the school bus is in strict compliance with safety design standards, generally with very thick steel plate, while school bus also assem