cleaned oil

例句：

1. 1. The refineryhas been cleaned up and is now producing clean oil.
   炼油厂已经清理干净，现在正在生产净化油。
2. 2.The new engine uses clean oil to reduce emissions.
   新引擎使用净化油来减少排放。
3. 3.The use of clean oil in transportation has significantly reduced air pollution.
   运输中使用的净化油显著减少了空气污染。