It covers all the exam question types, as well as key grammar and vocabulary which, from research into the Cambridge Learner Corpus, are known to be useful to candidates doing the test.
书中涵盖了对全部考试题型、重点语法及词汇等的分析和练习，且这些语法和词汇均通过对“剑桥学习者语料库”的调查研究而总结得出，对想要在考试中取得高分的考生非常有帮助。
Printing indeed played a key role in standardizing and stabilizing these languages by fixing them in print, and producing dictionaries and grammar books.
通过在印刷品中修正语言，以及生产字典和语法书，印刷术确实在规范和稳定这些语言方面发挥了关键作用。
But to constitute their own language, they would need a key component: grammar.
但是要组成一个他们自己的语言，必须要有一个关键的组成部分：语法。
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