Lubricant

(noun.) a substance capable of reducing friction by making surfaces smooth or slippery.

校对:克劳斯

• The diving case is not absolutely water-tight, nor is it desired that it should be so, as the slight leakage acts as a lubricant to the joints, and aids in their movements. 佚名. 神奇的知识之书.
• Edison has strong convictions on the liberal use of lubricants, but argued that in the ordinary oiling of machinery there is great waste, while much dirt is conveyed into the bearings. 弗兰克·刘易斯·戴尔. 爱迪生的生平和发明.
• Lubricants of all kinds had been and are used; but Babbitt's invention was an anti-friction metal. 威廉·亨利·杜利特. 世纪发明.

校对:马特