唯有在失去健康之后，我们才能了解大学英语四级词汇书健康的重要。
Only after you lose your health, will you realize the importance of health.
本文正是基于这一理论和方法对大学英语四级考试中的词汇与语法结构部分的效度进行研究论证。
Based on this theory, this article is supposed to conduct a study of the validity of vocabulary and grammar and structures of CET4. Validity is one of the most important criteria of a test.
运用语料库的方法，调查了134篇大学英语四级写作语料中的词汇错误。
Adopting the method of corpus, this paper investigates lexical errors in 134 pieces of CET4 writing.
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