Warning: file_put_contents(/www/wwwroot/ppbbu/4cd.cn/cache/db32baea92209ac4128678206d8b4999.txt): failed to open stream: No space left on device in /www/wwwroot/ppbbu/4cd.cn/index.php on line 55 normal incident ray是什么意思，normal incident ray的翻译，normal incident ray音标、读音、用法和例句_沉淀汉英词典
Angle of Incidence The angle between an incident ray and the normal to a reflecting or refracting surface. 入射角度入射光与照射在反射或折射平面上的正常光线之间的角度。 http://chazidian.com