DICT.TW Dictionary Taiwan

 air pocket
 氣井

 Air hole
 1. A hole to admit or discharge air; specifically, a spot in the ice not frozen over.
 2. Founding A fault in a casting, produced by a bubble of air; a blowhole.
 3. Aëronautics A local region in the atmosphere having a downward movement and offering less than normal support for the sustaining surfaces of a flying machine, causing an airplane to drop suddenly.  Same as air pocket.
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 air pocket
      n : a local region of low pressure or descending air that causes
          a plane to lose height suddenly [syn: pocket, air hole]