Someone who is fluent in a particular language can speak the language easily and correctly. You can also say that someone speaks fluent French, Chinese, or some other language. 流利的
adjective [原级] （说话）流利的；（表达思想）熟练的，流畅的；（做事）娴熟的；畅流的，能流动的
She speaks fluent and idiomatic English. 她讲一口流利地道的英语。
