impaternate offspring

例句：

1. 1. The couple was unable to conceive a child after trying for several years.
   这对夫妇尝试了几年后仍然无法怀孕。
2. 2.The old man's sperm count was impaternate, making him infertile.
   这位老人的精子数量不足，导致他无法生育。
3. 3. The researcher discovered that the environment had an impact on the fertility of the animals.
   研究者发现环境对动物的繁殖能力有影响。