prilling

例句：

1. 1.The process of pearling involves the use of a specialized machine to remove impurities from the shells of mollusks.
   珍珠形成过程涉及使用专门机器从软体动物的壳中去除杂质。
2. 2.The pearling industry is highly profitable, but it also has significant environmental impacts.
   珍珠养殖行业非常有利可图，但同时也具有显著的环境影响。
3. 3.During the pearling process, the soft parts of the pearl are removed, leaving behind only the hard nacreous layer.
   在珍珠形成过程中，珍珠的柔软部分被移除，只留下坚硬的珍珠层。