His knowledge of the language is fair.

他对这种语言的了解相当不错。

youdao

I have only a limited knowledge of the language.

我对这门语言只有有限的了解。

youdao

We have thousands of readers who are not native English speakers but whose knowledge of the language is sufficient to take in these pages every day.

我们有成千上万母语非英语的读者，不过他们的英语知识足以让他们理解每天报纸上的内容。

youdao

But his expert knowledge of the music and its performers helped make jazz an international language.

VOA: special.2009.01.30

Literature, unlike everyday language, begins on the far side of this knowledge.

文学，与日常生活中的语言不同，它始于知识的边缘。

耶鲁公开课 - 文学理论导论课程节选

Her mother,Katherine, had a deep knowledge of books, art and the French language.

VOA: special.2009.07.12

Knowledge of the language is kept up mainly by people like him who belong to the Xibo people from China's far north-west.

ECONOMIST: One hundred years on, only a few native speakers remain

However, the study suggested understanding of Gaelic words and phrases was limited with just over one in 10 of the general public respondents claiming to have at least some knowledge of the language.

BBC: TV 'raises awareness' of Gaelic government report says

Exposure to parents and other relatives who speak Korean has given Kim some knowledge of the language -- she can generally understand the subject matter of the conversation -- but she can't read it and doesn't enunciate well.

CNN: After grieving, iReporter sets out to connect with Korean roots