| 释义 |
The birth rate for older women has declined, but, by contrast, births to teenage mothers have increased.大龄女性的生育率已有下降，但相比之下少女妈妈的生育率却上升了。Utah has the highest fertility rate in the country.犹他州的生育率全国最高。High birth rates were often balanced out by high death rates.高生育率常被高死亡率抵消。Illegitimacy rates are soaring.非婚生育率激增。 |