sperm penetration

例句：

1. 1. The study of sperm penetration is crucial for understanding the reproductive process.
   研究精子穿透对于理解生殖过程至关重要。
2. 2. During intercourse, sperm penetrate the egg to fertilize it.
   性交时，精子穿透卵子以使其受精。
3. 3. Scientists are trying to understand how sperm penetrate the egg membrane to facilitate successful fertilization.
   科学家们正在尝试理解精子是如何穿透卵膜以促进成功受精的。