CD /ˌsiˈdi/
 光碟的簡稱;改變當前DOS目錄;載波檢測 ( carrier detect 的縮寫)


 cd
      adj : being one hundred more than three hundred [syn: {four
            hundred, 400]
      n 1: a soft bluish-white ductile malleable toxic bivalent
           metallic element; occurs in association with zinc ores
           [syn: cadmium, atomic number 48]
      2: the basic unit of luminous intensity adopted under the
         Systeme International d'Unites; equal to 1/60 of the
         luminous intensity per square centimeter of a black body
         radiating at the temperature of 2,046 degrees Kelvin [syn:
          candle, candela, standard candle]
      3: a debt instrument issued by a bank; usually pays interest
         [syn: certificate of deposit]
      4: a digitally encoded recording on an optical disk that is
         smaller than a phonograph record; played back by a laser
         [syn: compact disk, compact disc]