Read Edit View history 测风气球 cèfēngqìqiú pilot balloon Origin Definitions Defs Strokes Stroke Words Sentences Sents 测风气球 測風氣球 cèfēngqìqiú pilot balloon A balloon used to observe upper-air wind direction by tracking it from the ground with a theodolite.
测风气球 測風氣球 cèfēngqìqiú pilot balloon A balloon used to observe upper-air wind direction by tracking it from the ground with a theodolite.