vehicle maintenance grade

例句：

1. 1. The vehicle maintenancegrade is a crucial factor in determining the lifespan of a car.
   车辆维护等级是决定汽车使用寿命的重要因素。
2. 2. The company has introduced a new vehicle maintenance grade to improve customer satisfaction.
   该公司推出了一个新的车辆维护等级，以提高客户满意度。
3. 3. The vehicle maintenance grade system is designed to ensure that all vehicles meet safety standards.
   车辆维护等级制度旨在确保所有车辆都符合安全标准。