aged sperm

例句：

1. 1.The elderly man's aged sperm may have been responsible for his grandson's birth.
   这位老人的年老精子可能负责了孙子的出生。
2. 2.The old man's aged sperm could be the reason why he has no children.
   这位老人的年老精子可能是他无法生育的原因。
3. 3. The scientist discovered that aged sperm can still fertilize eggs and produce offspring.
   科学家发现，年老的精子仍然能够受精卵子并产生后代。