direction finder
柯林斯詞典
1. N a highly directional aerial system that can be used to determine the direction of incoming radio signals, used esp as a navigation aid (尤用于導航設備中的)無線電測向儀 (Abbreviation D/F, DF)
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1. N a highly directional aerial system that can be used to determine the direction of incoming radio signals, used esp as a navigation aid (尤用于導航設備中的)無線電測向儀 (Abbreviation D/F, DF)