re·ten·tion /rɪˈtɛn(t)ʃən/
 保留,保持


 re·ten·tion /rɪˈtɛnʧən/ 名詞
 停滯,貯留,保留,記憶,固定


 retention
 保留 保持


 Re·ten·tion n.
 1. The act of retaining, or the state of being ratined.
 2. The power of retaining; retentiveness.
 No woman's heart
 So big, to hold so much; they lack retention.   --Shak.
 3. That which contains something, as a tablet; a ░░░░ of preserving impressions. [R.]
 4. The act of withholding; retraint; reserve.
 5. Place of custody or confinement.
 6. Law The right of withholding a debt, or of retaining property until a debt due to the person claiming the right be duly paid; a lien.
 Retention cyst Med., a cyst produced by obstruction of a duct leading from a secreting organ and the consequent retention of the natural secretions.

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 retention
      n 1: the act of keeping in your possession [syn: keeping, holding]
      2: the power of retaining and recalling past experience; "he
         had a good memory when he was younger" [syn: memory, retentiveness]
      3: the power of retaining liquid; "moisture retentivity of
         soil" [syn: retentiveness, retentivity]