单词	focal ratio
释义	focal ratio noun : f-number Example Sentences Recent Examples on the Web An eyepiece changes the focal ratio of your telescope, thus changing the magnification. Cameron Johnson, Popular Mechanics, 10 Nov. 2020 Word History First Known Use 1883, in the meaning defined above
随便看	groenendaeles groenendaels groenlandiae groenlandias groff Grofé grog grog blossom grogger groggeries groggery groggier groggiest groggilier groggiliest groggily grogginess grogginesses groggy grognard grogram grograms grogs grogshop grogshops

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