Birth rates are notoriously difficult to predict.

众所周知，率是很难预测的。

The birthrate in the city has been decreasing.

该市的率一直持续下降。

2Mean values of leaf natality(A)and leaf mortality(B).

图2率(A)和死亡率(B)的平均值 Fig.

The birthrate is on the decline.

率在下降。

The birthrate is on the decrease.

人口率正在下降。

The birthrate is down this year.

年率下降。

Increasingly, worried European governments are crafting natalist policies to nudge couples to have more children, from offering better child care to monthly stipends keyed to family size.

逐渐的，烦脑的欧洲政府正编织率政策夫妻有更多小孩，从提供更好的孩童照顾到针对户量的每月津贴。