卵子

例句：

1. 1. The female mouse has a single functional egg at birth.
   雌性老鼠出生时只有一个功能性的卵子。
2. 2. The study of human reproduction is crucial for understanding the genetic makeup of our species.
   对人类生殖的研究对于理解我们物种的遗传构成至关重要。
3. 3. Eggs are the basic unit of life and play a vital role in reproduction.
   鸡蛋是生命的基本单位，在繁殖中起着至关重要的作用。