lubricating oil by pass purification

例句：

1. 1. The train passes the station on its way to the next city.
   火车在前往下一个城市的路上经过这个车站。
2. 2. He passed the exam with flying colors.
   他以优异的成绩通过了考试。
3. 3. The book is a classic that has been passed down from generation to generation.
   这本书是一本经典之作，代代相传。