英语词汇“d region”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	d region
释义	WordReference Random House Unabridged Dictionary of American English © 2024 D region, Aerospace, Physicsthe lowest region of the ionosphere, in which the D layer develops. 1925–30 Collins Concise English Dictionary © HarperCollins Publishers:: D region, D layer n the lowest region of the ionosphere, extending from a height of about 60 kilometres to about 90 kilometres: contains a low concentration of free electrons and reflects low-frequency radio waves
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