| 单词 | pilot balloon |
| 释义 | pilot balloon (once / 656629 pages) n WORD FAMILY pilot balloon: pilot balloons USAGE EXAMPLESThey even took readings high up in the air thanks to a pilot balloon. Time(Aug 16, 2011) My O'D. will, however, serve as a pilot balloon, and if it go up freely we can follow in the same direction. Downey, Edmund, Charles Lever, His Life in His Lett...(2011) The pilot balloon, that is so soon out of sight, can offer no guidance—don't forget that! Lever, Charles James, Luttrell Of Arran—Complete(2011) n meteorological balloon used to observe air currents Hyper meteorological balloon a small unmanned balloon set aloft to observe atmospheric conditions |
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