cir·cu·la·tion /ˌsɝkjəˈleʃən/
  流通,循環,發行量
  cir·cu·la·tion /ˌsɝkjəˈleʃən/ 名詞
  循環,肌覺
  circulation
  循環
  circulation
  循環
  Cir·cu·la·tion n.
  1. The act of moving in a circle, or in a course which brings the moving body to the place where its motion began.
     This continual circulation of human things.   --Swift.
  2. The act of passing from place to place or person to person; free diffusion; transmission.
     The true doctrines of astronomy appear to have had some popular circulation.   --Whewell.
  3. Currency; circulating coin; notes, bills, etc., current for coin.
  4. The extent to which anything circulates or is circulated; the measure of diffusion; as, the circulation of a newspaper.
  5. Physiol. The movement of the blood in the blood-vascular system, by which it is brought into close relations with almost every living elementary constituent. Also, the movement of the sap in the vessels and tissues of plants.
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  circulation
       n 1: the dissemination of copies of periodicals (as newspapers or
            magazines)
       2: movement through a circuit; especially the movement of blood
          through the heart and blood vessels
       3: (library science) the count of books that are loaned by a
          library over a specified period
       4: number of copies of a newspaper or magazine that are sold;
          "by increasing its circulation the newspaper hoped to
          increase its advertising"
       5: free movement or passage through a series of vessels (as of
          water through pipes or sap through a plant)
       6: the spread or transmission of something (as news or money)
          to a wider group or area