英语词汇“focal ratio”的英英意思、用法、释义、翻译、读音、例句、短语、词组-英语词典

单词	focal ratio
释义	focal ratio in British English noun photography another name for f-number f-number in British English or f number noun photography the numerical value of the relative aperture. If the relative aperture is f8, 8 is the f-number and indicates that the focal length of the lens is 8 times the size of the lens aperture See also T-number focal ratio in American English noun Optics & Photography f-number Word origin [1925–30]This word is first recorded in the period 1925–30. Other words that entered Englishat around the same time include: chain reaction, decibel, dropout, off-line, runout
随便看	not bad not bat an eye not bat an eyelid not-bat-an-eyelid not bat an eyelid not bat an eye not be able to run a chook raffle not be a patch on something or someone not beat about the bush not be cut out for something not before time not be getting anywhere/not be going anywhere not-be-getting-anywhere-not-be-going-anywhere not-be-in-the-business-of-doing-something not be in the business of doing sth not be one's scene not-be-ones-scene not be sb's department not-be-someones-department not be someone's keeper not-be-someones-keeper not be the end of the world not-be-the-end-of-the-world not be worth the paper it is written on not beyond the realms/bounds of possibility not-beyond-the-realms-bounds-of-possibility

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focal ratio in British English