loop·hole /ˈlupˌhol/
 鎗眼,小窗,換氣孔


 Loop·hole n.
 1. Mil. A small opening, as in the walls of fortification, or in the bulkhead of a ship, through which small arms or other weapons may be discharged at an enemy.
 2. A hole or aperture that gives a passage, or the means of escape or evasion.

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 loophole
      n 1: an ambiguity (especially one in the text of a law or
           contract) that makes it possible to evade a difficulty
           or obligation
      2: a small hole in a fortified wall; for observation or
         discharging weapons