As a result , nacre thickness is sometimes just a cosmetic layer that can wear thin over time 所以真珠質(zhì)的厚度就像臉上化妝品,不久就會磨薄了。
Fine pearls do not have any flaws or spots in the nacre : it has an even , smooth texture 在這些透明的真珠質(zhì)層上反射和衍射所形成的。有些珍珠會有
Recent advances in nacre used as bone implant are reviewed in this paper 摘要珍珠層是一種天然的納米生物陶瓷材料,一直是生物礦物材料學(xué)者研究的焦點。
Pearls are organic gems , created when an oyster covers a foreign object with beautiful layers of nacre 珍珠是有機(jī)寶石,是一些雙殼的軟體動物的產(chǎn)物。
It is likely that nacre will become a good candidate for bone graft substitution in future 認(rèn)為珍珠層是一種很有前途的骨植入材料,提出了今后研究的方向。
The pearl continues to grow in size as thousands of layers of the nacre continues to build around the pearl 尤為特別的是,它的銀光之上有一層閃爍的彩光,美艷而神秘。
Cultured and natural pearls will feel slightly rough , like fine sandpaper , because of the texture of natural nacre 。天然珍珠和人工養(yǎng)殖珍珠會有些許粗躁的感覺,如同細(xì)砂紙般,那是真珠質(zhì)的天然觸感。
When selecting a pearl , consider that the larger the pearl , the more nacre it has , so it will also exhibit even more luster 這些珍珠層是平行的,剖面呈同心圓結(jié)構(gòu)。每一珍珠層都十分光滑,而且是半透明的。
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,受到污染的水會改變真珠質(zhì)和珍珠的顏色。