interfertility

例句：

1. 1. The couplehas been trying for several years to conceive a child but have not succeeded.
   这对夫妇已经尝试了好几年才怀孕，但一直没有成功。
2. 2. The doctor advised the woman to undergo fertility testing before attempting to conceive again.
   医生建议这名妇女在再次尝试怀孕之前进行生育测试。
3. 3. Infertility is a common cause of unplanned pregnancies and can be caused by various factors such as genetics, hormone imbalances, or medical conditions.
   不孕是意外怀孕的常见原因，可能由遗传、激素失衡或医疗条件等引起。