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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	drys drysalter drysalteries drysalters drysaltery drystone drystone wall dryth irenics irenidaes ires iresine iresines Ireton Irgunist irian jaya Iriartea Iricism iricize irid Iridaceae iridaceaes iridaceous iridectomies iridectomize

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