sterile caste

例句：

1. 1. The farmer's wife had a sterile marriage because of her husband's alcoholism.
   这位农民的妻子因为丈夫的酗酒而婚姻不育。
2. 2. The scientists discovered that the eggs were sterile, meaning they couldn't be used for breeding.
   科学家们发现这些卵是无生殖能力的，意味着它们不能用于繁殖。
3. 3. The couple had been trying to conceive for years, but their sterile sperm made it impossible.
   这对夫妇多年来一直试图怀孕，但他们的无生殖精子让这变得不可能。