fuel/'fjuːəl/

n. a substance such as coal or oil that can be burned to provide heat or power

n. [C; U] 燃料：nuclear fuel 核燃料

◇Coal is one of the cheapest fuels. 煤是最便宜的燃料之一。

构词与fire有关

用法fuel泛指燃料时，是不可数名词，指燃料的种类时，用作可数名词。