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  1. Oxford American Dictionary

    pilot balloon

    • IPA[ˈpīlət bəˌlo͞on]
    • n.
      a small meteorological balloon used to track air currents.

    • noun: pilot balloon, plural noun: pilot balloons

    • 更多解釋

    pilot balloon

    • n.
      a small meteorological balloon used to track air currents.

    Oxford Dictionary