pla·toon /pləˈtun, plæ-/
  排,一組,一群人
  Pla·toon n.  Mil. (a) Formerly, a body of men who fired together; also, a small square body of soldiers to strengthen the angles of a hollow square. (b) Now, in the United States service, half of a company.
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  platoon
       n 1: a military unit that is a subdivision of a company; usually
            has a headquarters and two or more squads; usually
            commanded by a lieutenant
       2: a team of policemen working under the military platoon
          system
       3: a group of persons who are engaged in a common activity;
          "platoons of tourists poured out of the busses"; "the
          defensive platoon of the football team"