The poem uses simple language.

这首诗用语简单。

《牛津词典》

youdao

This simple language learning skill will help you understand these everyday words.

这个简单的语言学习技巧有助于你理解这些日常词汇。

youdao

He showed that simple American English could be as fine an instrument for great writing as more complex language.

VOA: special.2010.03.21

So, here's an example of a simple language.

这里有个简单的语言例子

耶鲁公开课 - 心理学导论课程节选

And you don't speak the language, but you do speak English because you've mastered these simple patterns.

你并不会说当地的语言，但你已经掌握了这些简单的句型，能够用英语交流。

There is 课堂 - SpeakingMax英语口语达人

Posner, in clear and simple language, demolishes the idea it was the warning label.

FORBES: At Last A Judge Who Understands Warnings Overload

Unfortunately, both critics and champions of alternative funds attempt to reduce complex financial transactions into simple language.

FORBES: The Simple Truth about Hedge Funds

Simple language can be elegant, and deceptively plain declarative syntax is capable of hinting at a rich emotional complexity teeming underneath.

ECONOMIST: New fiction