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	toploftical toploftier toploftiest toploftily toploftiness toploftinesses toplofty topmaker topmakers topmaking topman topmast topmasts topmen topminnow topminnows topmost topmoster topmostest topmostly topnotcher topnotchers topnotchest topo topo-

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