单词	fluor crown
释义	fluor crown noun : a crown glass that contains fluorine, that has a low refractive index, and that is used especially for optical equipment Word History Etymology fluor-
随便看	combinatorics combinatory combinatory logic combine combine forces combine type combined combined carbon combined experience table combined method combined operation combinement combiner combiners combines combinet combing combing (out) combing machine combing out combing wool combings combining combining form combining weight

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