a substance capable of reducing friction by making surfaces smooth or slippery
造句
The performance of dry lubricants is improved by the preparation of the surfaces. 干潤滑劑的性能是靠表面的處理來改善的。
Water-based lubricants such as KY Jelly are preferred, and can be bought at most supermarkets, or pharmacists. 避免使用石油基潤滑劑，如凡士林或嬰兒油，因為這可以削弱避孕套，以及增加的機會，它的分裂。