diesel fuel grades

例句：

1. 1. The diesel engine is more efficient than the gasoline engine.
   柴油发动机比汽油发动机更高效。
2. 2.The diesel fuel grades are classified according to their energy content.
   柴油燃料等级是根据它们的能源含量分类的。
3. 3. The diesel fuel grades vary depending on the region and the type of vehicle being used.
   柴油燃料等级因地区和正在使用的车辆类型而异。