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parallel drum造句

"parallel drum"是什么意思   

例句與造句

  1. In 1923 the original parallel drum was replaced by a bi-cylindro drum which made the winding of coal much easier.
  2. By the 1880s, lens front mounted accessory shutter boxes were available, containing a rubberized silk cloth curtain ( also called a blind ) with one or more width slit cutouts wound around two parallel drums and using springs to pull a slit from one drum to the other.
  3. It's difficult to find parallel drum in a sentence. 用parallel drum造句挺難的

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