You want the reproductive rate below one.

你希望繁殖率低于一。

The biggest changes I've seen in terms of my career as a maternal health advocate, the rolling back of reproductive rates, in my country but also in a number of other countries around the world.

作为一位孕产妇健康倡导者，我在我职业生涯中见证的最大的变化就是，近年来生育率的不断下降，不仅是在美国，全世界都是如此。