| 释义 |
type drum type drum[′tīp ‚drəm] (computer science) A steel cylinder containing 128 to 144 lateral bands, each band containing the alphabet, the digits 0-9, and the standard set of punctuation marks such as commas and periods, and revolving at high speed; printing is achieved by a hammer facing each band and activated at the right time to cause a character to be printed on the paper flowing between hammers and drum. |