replacement rate造句怎么写

Fertility rates in many European nations and Japan have dropped below the replacement rate, causing concern that shortages of labor and productivity could threaten the quality of life.

For them the key decisions are: when do they want to retire, how much do they want to save, and what minimum proportion of their final salary, or "replacement rate", do they wish to target?

In France the fertility rate is already around two children per female, not far short of the “replacement rate” which keeps population numbers steady.

America is the only rich country that, having fallen below the replacement rate, has risen back above it.

This obscures the point: for every big advanced country besides America and Israel, the alternative to “replacement rate” fertility is a baby bust.