karyopsis

例句：

1. 1.The karyopsis is a small, densely packed structure in the center of the cell.
   核仁是细胞中心的一个小而密集的结构。
2. 2. The study of karyopsis has led to important discoveries about the function of chromosomes.
   关于核仁的研究导致了关于染色体功能的重要发现。
3. 3.The karyopsis is responsible for the production of ribosomes, which are the building blocks of proteins.
   核仁负责生产核糖体，它们是蛋白质的构建块。