1N-MASS (尤用于机械的)润滑剂,润滑油 A lubricant is a substance which you put on the surfaces or parts of something, especially something mechanical, to make the parts move smoothly. (尤用于机械的)润滑剂,润滑油
Its nozzle was smeared with some kind of lubricant.
它的喷嘴抹了某种润滑油。
...industrial lubricants.
工业用润滑油
2N-COUNT (比喻有利于事情顺利进行的)润滑剂 If you refer to something as a lubricant in a particular situation, you mean that it helps to make things happen without any problems. (比喻有利于事情顺利进行的)润滑剂
I think humor is a great lubricant for life. [+ for]