正染色体的

例句：

1. 1. The acrosome is the outer layer of the sperm cell.
   外胚层是精子细胞的外层。
2. 2.The acrosome is where the sperm head attaches to the egg.
   外胚层是精子头部附着到卵子的地方。
3. 3. The acrosome is also thought to play a role in fertilization.
   外胚层还被认为是在受精过程中发挥作用。