So, while we can, we ought to concentrate on teaching children something really useful.
所以，当我们可以的话，我们应该集中精力去教孩子一些真正有用的东西。
We have gone so far as to collect some useful statistics.
我们甚至收集到一些有用的统计资料。
So we categorize information and retain just enough to be useful in anyone area.
所以我们对信息进行分类，仅在任一领域中留下够用的信息。
So we categorize information and retain just enough to be useful in anyone area.
所以我们对信息进行分类，仅在任一领域中留下够用的信息。
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