单词	air gap
释义	air gap noun 1 : an air-filled gap in a magnetic or electric circuit (as the space between the field-magnet poles and the armature in a dynamo or motor) 2 : wind gap 3 : the vertical distance between the point where water enters a plumbing fixture (as a tub) and the level at which it would overflow Word History First Known Use 1878, in the meaning defined at sense 1
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