英语词汇“ultralow frequency”是什么意思，“ultralow frequency”的读音、用法及例句翻译-烛光网

词汇	ultralow frequency
释义	ultra·low frequency AHD[ŭl'trə-lōʹ] D.J.[ˌʌltrəˈləʊ]K.K.[ˌʌltrəˈlo]n.（名词）abbr. ULF【缩写】 An electromagnetic wave whose frequency is less than 3,000 hertz.极低频率：频率少于3000赫兹的电磁波
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