normal type of embryo sac

例句：

1. 1. The normal type of embryo sac is crucial for the development of a successful pregnancy.
   正常类型的胚囊对于成功怀孕的发展至关重要。
2. 2. During fertilization, the sperm and egg meet in the normal type of embryo sac.
   在受精过程中，精子和卵子在正常类型的胚囊中相遇。
3. 3. Researchers have found that the normal type of embryo sac plays a significant role in determining the success of a pregnancy.
   研究人员发现，正常类型的胚囊在决定怀孕成功方面起着重要作用。