同时将出生胎次与累积生育率相比较以评价最近家庭生育的覆盖范围。

We also compared parity to cumulative fertility data to evaluate the coverage of recent household births.

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随着时间累积，低生育率不止会儿童数量减少，随着需要人照顾的老年人人口膨胀，处于工作年龄段的人口数量也会减少。

Over time, low birth rates lead not only tofewer children, but also to fewer working-age people just as the percentage ofdependent elders explodes.

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