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wind direction indicator
生命科学, 技术	indicatore della direzione del vento
英语 词库
Wind Direction Indicator
气象, 缩写	WDI
wind direction indicator
航空, 加拿大	An indicator that is in the form of a truncated cone made of fabric and that is not less than 12 ft long and, at the larger end, not less than 3 ft in diameter, so constructed as to give a clear indication of the direction of surface wind and a general indication of wind speed; An actuated device for indicating visually to aircraft the direction of surface wind