| 1. | As a result , nacre thickness is sometimes just a cosmetic layer that can wear thin over time
所以真珠质的厚度就像脸上化妆品，不久就会磨薄了。 |
| 2. | Fine pearls do not have any flaws or spots in the nacre : it has an even , smooth texture
在这些透明的真珠质层上反射和衍射所形成的。有些珍珠会有 |
| 3. | Recent advances in nacre used as bone implant are reviewed in this paper
摘要珍珠层是一种天然的纳米生物陶瓷材料，一直是生物矿物材料学者研究的焦点。 |
| 4. | Pearls are organic gems , created when an oyster covers a foreign object with beautiful layers of nacre
珍珠是有机宝石，是一些双壳的软体动物的产物。 |
| 5. | It is likely that nacre will become a good candidate for bone graft substitution in future
认为珍珠层是一种很有前途的骨植入材料，提出了今后研究的方向。 |
| 6. | The pearl continues to grow in size as thousands of layers of the nacre continues to build around the pearl
尤为特别的是，它的银光之上有一层闪烁的彩光，美艳而神秘。 |
| 7. | Cultured and natural pearls will feel slightly rough , like fine sandpaper , because of the texture of natural nacre
。天然珍珠和人工养殖珍珠会有些许粗躁的感觉，如同细砂纸般，那是真珠质的天然触感。 |
| 8. | When selecting a pearl , consider that the larger the pearl , the more nacre it has , so it will also exhibit even more luster
这些珍珠层是平行的，剖面呈同心圆结构。每一珍珠层都十分光滑，而且是半透明的。 |
| 9. | Not only then are the smaller , less robust creatures but the pollution in the water changes the color of the nacre and changes the color of the pearl
珠蚌不但更小，生命力更弱，受到污染的水会改变真珠质和珍珠的颜色。 |
