Birth rates go down for many reasons.

率下降原因有很多。

Which of these nations has the lowest birth rate?

以下哪个国家率最低？

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

所有这些族群率维持在平均以上。

Experts say there are many reasons for falling birth rates.

专家说，率下降原因有很多。

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

十几岁和二十几岁女性育率创最低记录。

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

由于该政策，中国率大幅下降。

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

战后率一度激增。

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

到目前为止，提高日本率一直是一场失败战斗。

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

青少年和20多岁女性育率下降。

But from 2014 to 2018, the twin birth rates fell 4 percent.

但在2014年至2018年，双胞胎率下降了4%。

It will also help to increase the country's declining birth rate.

这也帮助提高国家不断下降率。

But as birth rates have fallen, pets have become more intimate companions.

但随着率下降，宠物已成为人类更亲密伴侣。

Just looking at recent years, the change in age specific birth rates has been drastic.

仅从近年来情况来看，各年龄段人口率变化是巨大。

Prince Edward Island, it has an aging population and a declining birth rate.

爱德华王子岛，面临着人口老龄化和率下降挑战。

A government report found the U.S. birth rate fell four percent in 2020.

一份政府报告发现，2020年美国率下降了4%。

Whether and when birth rates bounce back, and how high, has broad consequences.

率是否会反弹，在什么时候反弹，反弹多少，结果不定。

That means the effects of a falling birth rate are an even bigger problem.

这意味着率下降影响是一个更大问题。

Economic growth is one of the main factors affecting population growth and birth rates.

经济增长是影响人口增长和率主要因素之一。

Leaders also feared abortion was contributing to the fall of birth rates among white women.

同时也担心堕胎会降低白人育率。

Health experts say there is no single explanation for the falling twin birth rates.

健康专家表示，双胞胎率下降没有单一解释。