píng guāng
意思解释：（Zero dioptre）屈光度等于零。
原指从水平方向射来的光。1880年傅兰雅辑《格致汇编》第三册《照像略法》:“光线从上而下者，谓之直光;从旁横来者，谓之平光。”后指屈光度为零的(眼镜)。1906年颐安主人《沪江商业市景词》卷三《各式远镜显微镜》:“西人制镜…
Point to the light that shoots from horizontal way formerly. Is Fu Lan elegant 1880 collect does case send collection the 3rd according to like summary law : Ang Pi Ji by exhausted of of street of of Lu of brandish of unoccupied place from by horizontal arrival, calling zero dioptre. hind show diopter is of 0 (glasses) . Is Yi An master 1906 statement of situation of city of Shanghai river traffic roll 3 is various Yuan Jingxian small lens : Unplug is evil spirit crisp by idle
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