primary constriction

• 主缢痕,初级缢痕

primary constriction的用法和样例：

例句

1. The centromere is a specific genetic locus and remains relatively uncoiled during prophase, appearing as a primary constriction.
   着丝粒是一个特化的遗传区域，在细胞分裂的早期始终保持解开的结构，所以也叫做主缢痕。