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	muddles through muddling muddling along muddling through muddlingly muddly muddy muddy the waters muddy-mettled muddy-minded muddybreast muddyheaded muddying muddyings Mudejar mudejares mudfish mudfishes mudflaps mudflat mudflats mudflow mudflows mudge mudged

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