draw·bridge /-ˌbrɪʤ/
 可開閉的弔橋


 Draw·bridge n. A bridge of which either the whole or a part is made to be raised up, let down, or drawn or turned aside, to admit or hinder communication at pleasure, as before the gate of a town or castle, or over a navigable river or canal.
 Note: ☞ The movable portion, or draw, is called, specifically, a bascule, balance, or lifting bridge, a turning, swivel, or swing bridge, or a rolling bridge, according as it turns on a hinge vertically, or on a pivot horizontally, or is pushed on rollers.

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 drawbridge
      n : a bridge that can be raised to block passage or to allow
          boats or ships to pass beneath it [syn: lift bridge]