postacrosomal ring

例句：

1. 1. The postacrosomal ring is a structure found in the nucleus of eukaryotic cells.
   后生核环是真核细胞核中的一种结构。
2. 2. The postacrosomal ring plays a crucial role in the regulation of gene expression.
   后生核环在基因表达的调节中起着至关重要的作用。
3. 3. The postacrosomal ring is believed to be involved in the process of nuclear division.
   后生核环被认为是参与核分裂过程的一部分。