dead oil

例句：

1. 1. The old engine has a lot ofdead oil in the cylinders.
   这台旧引擎的气缸里有很多死油。
2. 2.The car's engine is running smoothlyafter the oil was changed.
   换了油之后，这辆车的发动机运行得很顺畅。
3. 3.The old machine had to be dismantled and cleaned out because of thedead oil.
   这台旧机器因为死油不得不拆解和清理。