词汇通常是一个词，但这不是必要的。
对于学习语言的人来说，积累词汇是非常必要的。
It's necessary for a language learning student to build up vocabulary.
在有效的英语学习中，善于学习词汇是必要的。
积累词汇对我言是非常有必要的了。
It is very necessary for me to collect amount of new words and vocabularies.
各种短语词汇书是必要的，但学习语言的最好方法是听。
Phrase books are all very well, but listening is the best way to learn.
如今，“物流”一词已成为与正常生活相关的必要词汇。
Nowadays, the term of "logistics" has become a necessary word relate to the normal life.
如今，“物流”一词已成为与正常生活相关的必要词汇。
Nowadays, the term of "logistics" has become a necessary word relate to the normal life.
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