英语词汇“cosmic year”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典-现代词典

单词	cosmic year
释义	cosmic year noun : the estimated time required for a star at the sun's distance from the center of the Milky Way galaxy to make one trip around it in a circular orbit, about 200 million years
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