不发达国家的人民现在在生育子女方面有更多自由，因此家庭人数能受到控制。
People in poor countries are now able to exert more control over their own fertility, and hence over the size of their families.
不发达国家的人民现在在生育子女方面有更多自由，因此家庭人数能受到控制。
People in poor countries are now able to exert more control over their own fertility, and hence over the size of their families.
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