Natural pearls are hard to find.
很难找到天然珍珠。
Natural pearl
原声例句
透视百科商业类
透视百科商业类
What is a natural pearl, and how are they formed?
什么是天然珍珠? 它们又是如何形成的呢?
透视百科商业类
So a natural pearl would have all of those concentric layers of growth from the very inside out.
天然珍珠从里到外都生长着这些同心层。
透视百科商业类
Natural pearls form when some kind of irritant, usually a small organism, makes its way into the shell of a mollusk like an oyster or a mussel.
当某种刺激物，（通常是一种小生物），进入牡蛎或贻贝等软体动物的外壳时，天然珍珠就可以形成了。
爱豆飙英语
And embellished by a chain featuring natural irregular baroque pearls, as you can see.
如您所见，饰有一条带有天然不规则巴洛克珍珠的链条。
透视百科商业类
He says that part of the reason the Marie Antoinette pearl is worth so much is because it's a natural pearl, which brings us to one quality that determines a pearl's value.
他说，玛丽·安托瓦内特的珍珠之所以价值不菲，部分原因在于它是天然珍珠，这是决定珍珠价值的品质之一。
中文百科
珍珠 Pearl
（重定向自Natural pearl）
珍珠 (Pearl) 是一种由软体动物（主要是牡蛎）生产的硬的、圆滑的产物。珍珠一般被用在首饰和珍宝行业中。
珍珠的特有的光泽是光在这些透明的真珠质层上反射和衍射造成的，珍珠质层越薄越多，光泽就越漂亮。一些珍珠的荧光是由不同真珠层对入射光不断的折射所形成的。一般的珍珠是白色的，有时有米黄色或粉色的光泽，也有些珍珠带有黄色、绿色、蓝色、棕色或黑色的颜色。黑珍珠因其鲜有而昂贵。
英语百科
Pearl 珍珠
（重定向自Natural pearl）
A pearl is a hard object produced within the soft tissue (specifically the mantle) of a living shelled mollusk. Just like the shell of a clam, a pearl is composed of calcium carbonate in minute crystalline form, which has been deposited in concentric layers. The ideal pearl is perfectly round and smooth, but many other shapes (baroque pearls) occur. The finest quality natural pearls have been highly valued as gemstones and objects of beauty for many centuries. Because of this, pearl has become a metaphor for something rare, fine, admirable and valuable.
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