lubrication
  潤滑;油潤;注油
  lu·bri·ca·tion /ˌlubrəˈkeʃən/ 名詞
  潤滑,潤滑作用,滑潤法
  Lu·bri·ca·tion n. The act of lubricating; the act of making slippery.
  ◄ ►
  lubrication
       n 1: the condition of having been made smooth or slippery by the
            application of a lubricant
       2: an application of a lubricant to something