语言表达难度等级评价 lexical complexity
所选材料的概念和语言难度应有一定的范围。
There should be a range in conceptual and linguistic difficulty.
本文是一篇英语阅读的实验报告，着重调查背景知识与文章的语言难度对英语阅读理解的影响。
This paper investigates the effects of background knowledge and language complexity on English reading comprehension for Chinese students of intermediary level.
一些探讨英语语言的书籍常对英语的难度和独特风格大为赞叹。
CERTAIN genre of books about English extols the language's supposed difficulty and idiosyncrasy.
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