在最近进行的人口普查中，细心的普查员发现这样一个奇特的现象，当某一对夫妇没有孙子或孙女的时候，则他们的儿子同时也就没有生育。

由此，专家们证实，不孕症是由于遗传引起的。

When our second child was on the way， my wife and I attended a pre-birth class aimed at couples who had already had at least one child.

The instructor raised the issue of breaking the news to the older child. It went like this:

"Some parents，" she said， "tell the older child， ‘We love you so much we decided to bring another child into this family.‘ But think about that. Ladies， what

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