To be noticed that the spiral grains on the surface of nacreous layer of Hyriopsis schiegeli shells and its pearls are rarely found in other fresh water cultured pearls.
英
美
释义
值得注意的是,在池蝶蚌贝壳及其珍珠的珍珠层表面出现螺旋状纹理,这种现象在其它的淡水珍珠(如三角帆蚌贝壳及其珍珠)中极为少见。
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