pile up
 堆集,積累


 pile up
      v 1: collect or gather; "Journals are accumulating in my office";
           "The work keeps piling up" [syn: accumulate, cumulate,
            conglomerate, gather, amass]
      2: arrange into piles or stacks; "She piled up her books in my
         living room" [syn: heap up, stack up]
      3: get or gather together; "I am accumulating evidence for the
         man's unfaithfulness to his wife"; "She is amassing a lot
         of data for her thesis"; "She rolled up a small fortune"
         [syn: roll up, collect, accumulate, amass, compile,
          hoard]