brightnessn.光亮；明亮；聪明brightness discriminaton亮度鉴别能力Brightness area metering亮部法brightness multiplication亮度倍增brightness of white field白场亮度Brightness variance ratio亮度变化率brightness contrast range亮度对比范围brightness discrimination明度辨别,亮度鉴别brightness signal detector亮度信号检测器brightness contrast border亮度对比界限brightness modulation unit辉度调节单位(超声心动图)