So dont be surprised if you never encounter some of the expressions that still appear in school textbooks; and next time you hear somebody using a strange word you hxdyent heard before，you can comfort yourself that there may well be a native speaker somewhere who doesnt know it either.
结构分析:句子的框架是dont be surprised if youand next time， you can comfort yourself that。分号连接两个并列分句。在前面句子中，if引导状语从句;关系代词that引导定语从句，修饰expressions。在后面句子中，you hear是省略了关系副词when的定语从句，修饰next time; you hxdyent heard before又是省略了关系代词which的定语从句，修饰strange word;主句是you can comfort yourself that，这里的that引导宾语从句，而关系代词who引导定语从句，修饰native speaker。may和well连用表示有充分的理由，译为(完全)能，(很)可能。
译文：因此，如果在某些教科书里你碰到某些词组是你从未见过的，你不必惊讶。如果下次你听到有人用一个你以前从未听到过的新词，你可以这样安慰自己说，很可能在什么地方有一个讲英语的本地人也不认识这个字呢!