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	treacherous treacherously treacherousness treacherousnesses treachery treacle treacle mold treacle mould treacle mustard treacled treacles treaclewort treaclier treacliest treacling treacly tread tread lightly tread on (someone's) toes tread on one's toes tread on someone's toes tread on the toes of tread on the toes of (someone) tread on the toes of someone tread on toes

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