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	supercollider supercolliders supercolossal supercolumnar supercolumniation supercomfortable supercommentary supercompetent supercompetitive supercompression supercomputer supercomputers superconduct superconducted superconducting superconduction superconductions superconductive superconductivities superconductivity superconductor superconductors superconducts superconfident superconglomerate

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