They are familiar with English.

他们精通英语。

youdao

Nothing but patient study can make one familiar with English idioms.

只有耐心的学习，才可以使人通晓英语习语。

youdao

When you are familiar with English corner, you will find you can speak fluently.

当你对英语角熟悉之后，你会发现你可以在那儿谈吐自如。

youdao

As a former English teacher and someone who has lived abroad I can understand the concerns of people who have posted here, but would like to clarify for those who are not familiar with English language learning.

BBC: Overseas students 'buying essays'

Once Nexteer hit the auction block, the Chinese investors proved surprisingly thorough, even though some of them didn't speak English, said a person familiar with the transaction.

WSJ: The Game: A GM Unit in China's Hands

It is not just the all-too-familiar problems of urban poverty and unfamiliarity with the English language, or that the job may be too big New York has 1, 100 schools for any individual to run effectively.

ECONOMIST: New York��s schools