proliferation of Leydig's cell

例句：

1. 1.The rate of cell division is a measure of the proliferative state of the cells.
   细胞分裂速率是衡量细胞增殖状态的一种方式。
2. 2. The growth of the population has been increasing steadily over the past decade.
   过去十年里，人口增长稳步上升。
3. 3.The scientists discovered that the virus multiplied rapidly in the laboratory conditions.
   科学家们发现，这种病毒在实验室条件下迅速繁殖。