| 单词 | focal length |
| 例句 | DEFINITIVE EXAMPLES 权威例句〔FL〕Focal length.（透镜的）焦距美国传统〔accommodation〕Physiology The automatic adjustment in the focal length of the lens of the eye to permit retinal focus of images of objects at varying distances.【生理学】 眼调节：眼睛瞳孔对焦距的自动调节，以获得不同距离的物体在视网膜上的成像美国传统〔bifocal〕Having two focal lengths.双焦距的美国传统〔diopter〕A unit of measurement of the refractive power of lenses equal to the reciprocal of the focal length measured in meters.屈光度：透镜或棱镜折光率的一种量度，等于以米计算焦距之倒数美国传统〔focal point〕The focal length is the distance between the principal point of a lens and the focal point.焦距是透镜的主点与焦点之间的距离。外研社新世纪〔trifocal〕A lens having three focal lengths.三焦距透镜美国传统〔trifocal〕Having three focal lengths.三焦距的：有三个焦距的美国传统〔zoom lens〕A camera lens whose focal length can be rapidly changed, allowing rapid change in the size of an image.可变焦距镜头：可以快速变动焦距的照相机镜头，使图像的大小可以快速变换美国传统 |
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