lubricant [ˈlubrɪkənt]

例句:

• This lubricant is a jelly-like substance called synovial fluid.
  来自BBC
• I think humor is a great lubricant for life.
  我认为幽默是人生的上好润滑剂。
  
• Its nozzle was smeared with some kind of lubricant.
  它的喷嘴抹了某种润滑油。
  
• Most mechanical devices require oil as a lubricant.
  绝大多数机械装置都需要用油作为润滑剂。
  
• The solution is to use extra lubricant during foreplay and intercourse.
  来自BBC
• It is thought to clean the urethra before ejaculation and act as a lubricant during sex.
  来自BBC