在过去的几个世纪中，人类的知识量呈指数状增加。
The amount of human knowledge has increased exponentially over the past few centuries.
掌握一些构词法知识，可以大大地增加自身的词汇量。英语构词法主要有以下三种情况。
Have some knowledge of word-building, can greatly increase their vocabulary. English word-building mainly in the following three conditions.
我们已经学完这本书了，所以我决定介绍一些格外的话题： 我希望这些将能增加孩子的知识量。
We have already finished the book so I decided to introduce additional topics. I hope these will enrich your kids.
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