“ground-based navigation aid”的概念、定义、翻译、参考文献-科学参考

单词	ground-based navigation aid
释义	ground-based navigation aid [`grau̇nd ´bāst ´nav·ǝ`gā·shǝn ´ād] ^NAVIGATION That portion of a navigation system which is located on the ground and emits signals or receives them from crafts or vehicles; these signals provide the navigation information.
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