period of yolk formation period

例句：

1. 1.During the period of yolk formation, the egg is still fragile and can easily be broken.
   在卵黄形成期，鸡蛋仍然很脆弱，容易破裂。
2. 2. The process of egg yolk formation is crucial for the development of the embryo.
   卵黄形成过程对胚胎发育至关重要。
3. 3. Researchers are studying the mechanisms behind the period of yolk formation to improve egg quality.
   研究人员正在研究卵黄形成机制，以改善鸡蛋质量。