重油燃料

例句：

1. 1. The heavy oil is used in the production of diesel engines.
   重油用于生产柴油发动机。
2. 2. Heavy oil is a source of energy that can be used to generate electricity.
   重油是一种能源，可以用来发电。
3. 3. The heavy oil is extracted from the ground and transported to refineries for processing.
   重油从地下提取并被运输到炼油厂进行加工。