n.润滑剂，润滑油,能减少摩擦的东西,<俚>奶油，黄油 adj.润滑的
Its nozzle was smeared with some kind of lubricant.
它的喷嘴抹了某种润滑油。
I think humor is a great lubricant for life.
我认为幽默是人生的上好润滑剂。
Most mechanical devices require oil as a lubricant.
绝大多数机械装置都需要用油作为润滑剂。