英语词汇“permanent echo”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	permanent echo
释义	WordReference Random House Unabridged Dictionary of American English © 2024 per′manent ech′o, [Electronics.] Electronicsa radar signal reflected to a radar station on the ground by a building or other fixed object.
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