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。

youdao

youdao

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。

youdao

Within 18 months of their arrival in South Australia in 1838, the missionaries had produced a definitive vocabulary of about 2, 000 Kaurna words, around 200 translated sentences and key elements of grammar.

BBC: Lost indigenous language revived in Australia