英语词汇focal length怎么读，是什么意思，单词翻译、读音、固定搭配用法和短语词组及例句-英汉双解词典

单词	focal length
释义	focal length Word family adjectivefocalnounfocalizationfocimeterfocusingfocal lengthfocal pointfocus groupfocusverbfocalizeadverbfocally ˈfocal length noun [countableC] technical the distance between the centre of a lens and the focal point 焦距 Examples from the Corpus focal length• Properties of a parabola All parabolas are similar. Focal length a determines the magnitude.• A single focal length, fixed-focus is often sufficient.• The image produced by a diverging lens is however frequently virtual and consequently the focal length does not seem easy to determine.
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