When the facial embrasures are opened, it is possible to increase the area of light deflection (shadows) and to reduce virtually the tooth smooth surface width (area of light reflection).是什么意思_When the facial embrasures are opened, it is possible to increase the area of light deflection (shadows) and to reduce virtually the tooth smooth surface width (area of light reflection).在線(xiàn)翻譯_英語(yǔ)_讀音_用法_例句