Definition: a substance that is burned to provide heat or power Level: B1
木材、煤炭、石油、汽油和天然气都是不同种类的燃料。
Wood, coal, oil, petrol and gas are all different kinds of ___fuel.
我的车使用无铅燃料时运行状态最佳。
My car runs best on unleaded ___fuel.
降低车速可以减少燃料消耗。
Reducing your speed can lead to lower ___fuel consumption.
