英语词汇“pilot balloon”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	pilot balloon
释义	pilot balloon noun A small meteorological balloon used to track air currents.Wind measurements were performed every 4 hours by tracking the ascent of a pilot balloon by radar.... This computes a vertical profile of wind direction and speed given the radio telemetry observations of a pilot balloon. With the growth of aviation activity in the country, pilot balloon observations were started in 1928 to generate daily upper air wind data for pilots.
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