The lack of excretion of scleroprotein probably contributes to the irregular layers which lead to the pearls with poor luster.

  • 淡水养殖无光珠的产生可能是由于有机质分泌不足,形成了不规则的珍珠层的结果。

  • 互联网摘选 2025-01-20 19:09:07

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