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	Paliurus paliuruses paliurusses Palk Strait palkee palkee gharry palkees palki pall pall-mall palla palladia Palladian Palladian window palladianism palladianisms palladic palladiferous palladinize Palladio palladious palladium palladium process palladiums palladize

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