heavy fuel

例句：

1. 1. The heavy fuel is used in the engine to provide power.
   重燃料被用于发动机中提供动力。
2. 2.Heavy fuel is a type of oil that is difficult to refine.
   重燃料是一种难以提炼的油。
3. 3. The heavy fuel was used as a source of energy for the mining operation.
   重燃料被用作采矿作业的能量来源。