英语词汇“diurnal arc”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	diurnal arc
释义	diurnal arc noun : the portion of the diurnal circle of a celestial body that is above the observer's horizon < the diurnal arc of the sun is its apparent path from sunrise to sunset >
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英语词典包含332784条英英释义在线翻译词条，基本涵盖了全部常用单词的英英翻译及用法，是英语学习的有利工具。