2.3词汇密度

词汇分类：

1. content words 实词
   • Noun
   • Verb
   • Adjective
   • Adverb 副词
2. Grammar words 虚词
   • Pronoun
   • Preposition 介词
   • Modal verb 情态动词
   • Conjunction 连词
   • Article 冠词

词汇密度：

1. Linguists who use the systemic functional framework have done a lot of interesting research into all the different types of roles that people play when they are interacting with one another.

• content words: 15

• grammar words: 16

• lexical density: 15:16

2. Systemic functional linguists have undertaken interesting research into the **roles different types **of people play in interactions.

• content words: 12
• grammar words: 5
• lexical density: 12:5

期刊论文的词语密度相对于其他文体要高，因为期刊论文要用尽可能少的词语表达尽可能多的信息，在同样篇幅里信息量更大。

How to reduce lexical density?

1. Avoid using a sentence where a phrase is appropriate.
2. Avoid using a phrase where a word is appropriate.