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	pakeha pakehas Pakhpuluk pakhpuluks Paki pakis Pakistan pakistani pakistanis pakistans paklava pakoras paktong pal pal (around) pal around pal around with pal up pala palabras palace palace car palace guard palaced palaces

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