| 释义 |
〔trifocal〕Having three focal lengths.三焦距的：有三个焦距的〔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〔dimmer〕Low beam.车头的短焦距光〔focus〕An apparatus used to adjust the focal length of an optical system in order to make an image distinct or clear:对焦仪器：为使其图象明显或清晰用于调节光学系统焦距的仪器：〔FL〕Focal length.（透镜的）焦距〔dim〕Low beam.车头的短焦距光 |