door·keep·er /-ˌkipɚ/
  看門的人
  Door·keep·er n. One who guards the entrance of a house or apartment; a porter; a janitor.
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  doorkeeper
       n 1: an official doorkeeper as in a courtroom or legislative
            chamber [syn: usher]
       2: the lowest of the minor Holy Orders in the unreformed
          Western Church but now suppressed by the Roman Catholic
          Church [syn: ostiary, ostiarius]
       3: someone who guards an entrance [syn: doorman, door guard,
           hall porter, porter, gatekeeper, ostiary]
  Door-keeper
     This word is used in Ps. 84:10 (R.V. marg., "stand at the
     threshold of," etc.), but there it signifies properly "sitting
     at the threshold in the house of God." The psalmist means that
     he would rather stand at the door of God's house and merely look
     in, than dwell in houses where iniquity prevailed.
       Persons were appointed to keep the street door leading into
     the interior of the house (John 18:16, 17; Acts 12:13).
     Sometimes females held this post.