primary oocytes

例句：

1. 1. Thestudy of the development and function of primaryoocytes is crucial for understanding human reproduction.
   研究初级卵细胞的发展和功能对于理解人类生殖至关重要。
2. 2. In mammals,primary oocytes are produced in theovaries and mature into eggs before beingreleased into the fallopian tubes.
   在哺乳动物中，初级卵细胞在卵巢中产生，成熟后进入输卵管。
3. 3.During fertilization, the sperm penetrates the zona pellucidaand the outer layer of the egg membraneto reach the primary oocytes.
   在受精过程中，精子穿透透明带和卵子外层膜，到达初级卵细胞。