gonad

例句：

1. 1. The gonads are responsible for producing hormones that regulate sex development.
   睾丸负责产生调节性别发育的激素。
2. 2. He has a small gonad and is unable to produce sperm.
   他有一个小睾丸，无法产生精子。
3. 3. The gonads are located in the male reproductive organs.
   睾丸位于男性生殖器官中。