The majority of couples have only one or two children.
大部分夫妇只有一个或者两个孩子。
This is because women in these countries have, on average, only one or two children.
这是因为这些国家的妇女，平均，只有一个或两个孩子。
The main difference is that we have many children not just one or two.
最主要的区别就是我们的孩子不止一个两个。
The main difference is that we have many children not just one or two.
最主要的区别就是我们的孩子不止一个两个。
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