n.润滑，加油,油润
Lubrication reduces noise and wear.
润滑作用能减少噪音和磨损.
We shall require more lubrication oil this month.
这个月我们需要更多润滑油.
Sludge can also clog oil passages and prevent normal engine lubrication.
油泥还会阻塞油路,妨碍发动机的正常润滑工作.