stack·up 
(stăkŭp′)
(stăkŭp′)n.
A deployment of aircraft circling an airport at designated altitudes while awaiting instructions to land.
| 单词 | stackup |
| 释义 | stack·up (stăkŭp′)n. A deployment of aircraft circling an airport at designated altitudes while awaiting instructions to land. |
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