fall in
 向內倒塌;集合,入列


 fall in
      v 1: break down, literally or metaphorically; "The wall
           collapsed"; "The business collapsed"; "The dam broke";
           "The roof collapsed"; "The wall gave in"; "The roof
           finally gave under the weight of the ice" [syn: collapse,
            cave in, give, give way, break, founder]
      2: to take one's place in a military formation or line; "Troops
         fall in!"
      3: become part of; become a member of a group or organization;
         "He joined the Communist Party as a young man" [syn: join,
          get together]