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(jī)械用的)潤(rùn)滑劑; 潤(rùn)滑油

Its nozzle was smeared with some kind of lubricant. 它的噴嘴上塗了種潤(rùn)滑油。

...industrial lubricants. ...工業(yè)用潤(rùn)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. (比喻有利於事情順利進(jìn)行的)潤(rùn)滑劑[usu supp N]

I think humour is a great lubricant for life. 我認(rèn)爲(wèi)幽默是一種上好的人生潤(rùn)滑劑。