The enamel layer of a tooth is made up of hydroxyapatite crystals, which form microscopic "rods".
牙齿最外层的牙釉质是由我们肉眼看不到的显微小管所组成的。
Teeth have a hard surface layer called enamel.
牙齿有一层叫做釉质的坚硬表层。
Inner enamel is mainly composed of ceramic layer and special enamelled steel two materials.
搪瓷内胆主要有瓷层及专用搪瓷钢板两种材料组成。
Staining from coffee is very superficial, effecting just the biofilm, a thin layer of bacteria which covers the teeth and gums, and doesn't penetrate through the enamel itself.
咖啡的着色是浅表性的，仅仅影响菌膜——覆盖牙齿和牙龈的一个很薄的细菌层，并不能穿透牙釉质。
The paper gives a description of several changes of the surface layer during formation of artificial caries in enamel.
本文描述了在釉质人工龋形成过程中，表层的各种改变，包括层板状病变。
The smear layer on enamel and dentin could be removed after conditioned by both phosphoric acid and pulse Nd:YAG laser.
电镜显示，磷酸酸蚀和激光照射，均可去除牙釉质和牙本质表面的玷污层。
Laser - cut enamel; the surfaces were not flat and devoid of a smear layer, with some evidence of prism structure, like fish scale.
激光切割牙釉质：表面不平，无法污层，釉柱结构清晰可见，呈鱼鳞状。
As we age, the outer layer of tooth enamel wears away.
随着年龄增长，我们牙齿外层的釉质会慢慢地磨损。
That's because hydrogen peroxide soaks through the protective outer coating of enamel and into the softer layer of dentin underneath, irritating the nerve-rich dental pulp at the core.
这是因为过氧化氢会渗入釉质的外部保护层并进入牙质下面的较为柔软的一层，刺激神经组织比较多的牙髓。
Outer layer of the tooth enamel and ivory to protect the pulp quality.
牙齿的外层有珐琅质及象牙质来保护牙髓。
Firstly, it's convenient for cleaning and the color would never fade for its surface has a layer of transparent glass-like enamel.
一：景德镇陶瓷缸表面有一层玻璃状透明釉质，清洗起来方便，颜色永远都不会发生变化；
There were thin gaps or voids in the hybrid layer between the flowable composite resin and the enamel probably leading to marginal leakage and the adsorption of the germs.
封闭剂与牙釉质的粘接面内存在微小孔隙，不排除边缘微渗漏及致龋菌吸附的可能。
Asphalt, coal tar enamel, fusion-bonded epoxy, polyethylene tape, 2-layer PE and 3-layer PE coatings may be used for corrosion control of underground pipelines.
埋地钢管的外防腐可采用沥青防腐层、煤焦油瓷漆防腐层、聚乙烯胶粘带防腐层、熔结环氧粉末防腐层、二层结构聚乙烯防腐层、三层结构聚烯烃防腐层等技术。
Asphalt, coal tar enamel, fusion-bonded epoxy, polyethylene tape, 2-layer PE and 3-layer PE coatings may be used for corrosion control of underground pipelines.
埋地钢管的外防腐可采用沥青防腐层、煤焦油瓷漆防腐层、聚乙烯胶粘带防腐层、熔结环氧粉末防腐层、二层结构聚乙烯防腐层、三层结构聚烯烃防腐层等技术。
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