lubricant

1. N-MASS A lubricant is a substance which you put on the surfaces or parts of something, especially something mechanical, to make the parts move smoothly. (尤指機械用的)潤滑劑; 潤滑油

Its nozzle was smeared with some kind of lubricant. 它的噴嘴上涂了種潤滑油。

...industrial lubricants. ...工業(yè)用潤滑劑。

2. N-COUNT If you refer to something as a lubricant in a particular situation, you mean that it helps to make things happen without any problems. (比喻有利于事情順利進行的)潤滑劑[usu supp N]

I think humour is a great lubricant for life. 我認為幽默是一種上好的人生潤滑劑。