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	andanter andantes andantest andantini andantino andantinos andaqui andaquian andaquis andean Andean condor andeaner andeanest andeanner andeannest anded andelmins Anderlecht Andermatt Anders anders Andersen andersens Anderson Anderson localization

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