secondary spermatogonium

例句：

1. 1. The study of the secondary spermatogonium is crucial for understanding human fertility.
   研究次级精原细胞对于理解人类生育能力至关重要。
2. 2.In this process, the secondary spermatogonium undergoes a series of changes to mature into spermatozoa.
   在这一过程中，次级精原细胞经历一系列变化成熟为精子。
3. 3. The discovery of new drugs targeting the secondary spermatogonium has opened up new avenues for treating infertility.
   发现针对次级精原细胞的新药物为治疗不孕症开辟了新途径。