约翰霍普金斯大学的社会学家安德鲁·切尔林说，对于为什么不同国家的生育率不同，“没有人能给出一个好的答案”。

"No one has a good answer" as to why fertility varies among countries, says sociologist Andrew Cherlin of The Johns Hopkins University.

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对于生活在没有自由媒体或公民社会的国家中的许多人，这份报告可能是他们了解这个问题的唯一信息来源。

For the many people who live in countries without a free press or civil society, it can be the only source of information they have on this issue.

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许多国家都有资本，许多国家都有聪明人，但没有一个国家真正能在社会对冒险者的接受度方面和美国相比。

Many nations have capital, many nations have smart people, but no nation really compares to the U.S. in terms of its willingness to accept risk takers in society.

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