fuel grade

例句：

1. 1. The car requires a certain fuel grade to operate properly.
   这辆车需要某种燃料等级才能正常运行。
2. 2.The new engine has a higher fuel grade than the old one.
   新发动机的燃油等级比旧的高。
3. 3.The company is considering switching to a higher fuel grade for its vehicles.
   该公司正在考虑将其车辆更换为更高燃油等级。