con·cen·tra·tion /ˌkɑn(t)sənˈtreʃən, ˌsɛn-/
 濃縮,集中,專注,專心,全神貫注
 con·cen·tra·tion /ˌkɑn(t)sənˈtreʃən, ˌsɛn-/ 名詞
 濃度,濃縮,濃集,濃縮物
 concentration
 集中
 Con·cen·tra·tion n.
 1. The act or process of concentrating; the process of becoming concentrated, or the state of being concentrated; concentration.
    Concentration of the lunar beams.   --Boyle.
    Intense concetration of thought.   --Sir J. Herschel.
 2. The act or process of reducing the volume of a liquid, as by evaporation.
    The acid acquires a higher degree of concentration.   --Knight.
 3. Metal. The act or process of removing the dress of ore and of reducing the valuable part to smaller compass, as by currents of air or water.
 ◄ ►
 concentration
      n 1: the strength of a solution; number of molecules of a
           substance in a given volume (expressed as moles/cubic
           meter)
      2: the spatial property of being crowded together [syn: density,
          denseness, compactness] [ant: distribution]
      3: strengthening the concentration (as of a solute in a
         mixture) by removing extraneous material [ant: dilution]
      4: increase in density
      5: complete attention; intense mental effort [syn: engrossment,
          absorption, immersion]
      6: bringing together military forces
      7: great and constant diligence and attention [syn: assiduity,
          assiduousness]