对于陶瓷，另一种类型的困难就是色彩在其表面的平整度。不管陶瓷是光泽的或是半光的，其表面平整度仍需要被考虑在其中。
For ceramic, another type of difficulty is the evenness of the color of the ceramic, whether the ceramic is gross or matt also need to take into considering.
天然牙的视觉外观除了颜色的三要素色相、明度、饱和度以外，还有许多第二光学特征：半透性、浑浊度、晕色、表面光泽度、荧光性，其中以半透性最为重要。
In addition to value, hue and chroma, there are many subtle secondary optical properties of natural human tooth, such as translucency, opacity, iridescence, surface gloss and fluorescence.
接着，穿过岸边半浸于水中的树和宽广潮湿的街道他瞥见阳光照射在水面的光泽。
Then, through the twisted half-drowned trees and wide wet streets, he glimpsed the silvery sheen of sunlight upon water.
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