brightness step亮度梯度brightnessn.光亮；明亮；聪明brightness coefficient aqueous亮度系数Brightness approaching my house光临舍下Brightness of Magnolia in Bloom玉兰盛开的灿烂Brightness Rather Than Darkness白多黑少brightness difference threshold光差, 亮度差阈brightness temperature gradient亮温梯度brightness temperature threshold亮温阈值brightness temperature pyrometer亮度-温度高温计brightness and remaining chlorine白度和残氯brightness light-emitting diode亮度发光二极管