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A navigational aid used in aircraft and ships which continuously and automatically displays the bearing of the nearest radio beacon; abbreviated ADF.
1930s; earliest use found in Science News.
雅致网英汉双解词典包含236457条英汉翻译词条，涵盖了常用英语单词及词组短语的翻译及用法，是英语学习的必备工具。