In the past, people worried a lot about the (增长) of the world population (然而), there is a new (问题) at present. That is a too low (出生) rate in the past ten years. This happens in both developed and developing countries. How does this happen? There are some (原因): Firstly, many (政府) support the family planning policy to reduce the population growth, and most of them have made great progress(进步) . Secondly, more people get (结婚) late. They want to succeed in business and have little time to think about marriage. Thirdly, many couples like to stay in a two-person world. They don't want to have (宝宝) . Lastly, more women go out to have higher education or to do more important work. They would rather go to work than have children. The countries with (更少) births than deaths could face a serious shortage(短缺) of young workers in the future. They must think of ways to (解决) it.
