英语词汇refractive index怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	refractive index
释义	refractive indexn. the ratio of the velocity of light in a vacuum to its velocity in a specified medium 折射率(光线在真空中传播速度与在某特定媒介中传播速度的比率)
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