petroleum residual oil

例句：

1. 1. The oil spill in the Gulf of Mexico has caused significant environmental damage.
   墨西哥湾的石油泄漏造成了严重的环境破坏。
2. 2.He used to work as a refinery worker, but now he's retired and enjoys fishing.
   他过去在炼油厂工作，但现在退休了，喜欢钓鱼。
3. 3. Crude oil prices have been rising steadily since the beginning of the year.
   自年初以来，原油价格一直在稳步上涨。