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词汇 focal length
类别 英汉双解翻译词典
释义 focal lengthn.(名词)abbr. f, FL【缩写】
  1. 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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