英语词汇“focal length”是什么意思，“focal length”的读音、用法及例句翻译-乐坝网

词汇	focal length
释义	focal lengthn.（名词）abbr. f, FL【缩写】 The distance from the surface of a lens or mirror to its focal point. Also called focal distance ,focus 焦距：从透镜或面镜的表面到焦点的距离也作 focal distance,focus
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