Birth rates go down for many reasons.

出生率下降的原因有很多。

Which of these nations has the lowest birth rate?

以下哪个国家出生率最低？

All of these groups continue to have above-average birth rates.

所有这些族群出生率将继续维持在平均以上。

Experts say there are many reasons for falling birth rates.

专家说，出生率下降的原因有很多。

And that other problem is an incredibly low birth rate.

另一个问题是出生率极低。

And birth rates for women in their teens and 20s reached record lows.

十几岁和二十几岁女性的生育率创最低记录。

Because of the policy, China's birth rate has dropped dramatically.

由于该政策，中国的出生率大幅下降。

After the war there was a bulge in the birth rate.

战后出生率一度激增。

So far, boosting Japan's birth rate has been a losing battle.

到目前为止，提高日本的出生率一直是一场失败的战斗。

Birth rates continued to fall for teenagers and women in their 20s.

青少年和20多岁女性的生育率继续下降。