descent of testicle

例句：

1. 1. The descent of the testicles is a complex process that involves hormones and genetics.
   睾丸的下降是一个复杂的过程，涉及激素和遗传。
2. 2.During puberty, the testicles undergo a significant descent to the scrotum.
   青春期时，睾丸会经历显著的下降到阴囊中。
3. 3. In some cases, this descent can lead to issues with fertility or sexual function.
   在某些情况下，这种下降可能导致生育问题或性功能问题。