gatekeeper [ˈɡetˌkipɚ]

例句:

• His secretary acts as a gatekeeper, reading all mail before it reaches her boss.
  老板的秘书负责把关，所有邮件都由她先过目再呈送给他。
  
• The old gatekeeper told them the streets were already closed to traffic.
  看门的李老头告诉他们:外面已经断绝交通了.
  
• Either the thief or the gatekeeper took the picture away.
  不是小偷就是守门人把画拿走了.
  
• Both of them hold that the judge is a gatekeeper.
  来自SA
• Don't position yourself as a gatekeeper or a social conscience.
  来自NEWYORKER
• The Gatekeeper butterfly also has specific 'eye markings' to distract prey.
  来自BBC