Years of eating, drinking and smoking stain these cracks darker than the enamel prisms.
长年的饮食与吸烟会把这些裂缝染得比琅质棱柱的颜色还深。
The rod-like hydroxyapatite may arrange or grow into bundles which are similar to the human enamel prisms in both appearance and size.
棒状羟基磷灰石晶体可以排列或生长为束状，与人牙釉柱中的晶体在形态和尺寸上相似；
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