... principal focal distances 释义：主焦距 principal focal distance 释义：主焦距 anterior focal distance 释义：主焦距,前焦距 ...
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anterior principal focal distance 前主焦距
primary principal focal distance 第一主焦距
secondary principal focal distance 第二主焦距
posterior principal focal distance 后主焦距
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Focal length: The distance between the centre of a lens and its principal focus.
焦距：镜头中心与其主焦点的距离。
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Focal length is the distance between optical centre and principal focus.
焦距就是镜片中心和焦点之间的距离。
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