英语词汇“principal ray”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	principal ray
释义	principal ray noun 1. : principal visual ray 2. : the one ray of the rays entering an optical instrument from any given point of the object that passes through the exact center of the aperture stop
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