气阱

[经] 气包, 空中陷井, 气潭

[ noun ]
a local region of low pressure or descending air that causes a plane to lose height suddenly
<noun.phenomenon>

Air pocket \Air" pock"et\ (p[o^]k"[e^]t). (aeronautics)
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 hole}.
[PJC.]

Air hole \Air" hole`\ ([^a]r" h[=o]l`).
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. (A["e]ronautics) 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}.
[Webster 1913 Suppl.]