B2 When a person is fluent, they can speak a language easily, well, and quickly.(指人说某种语言)流利的
B2 When a language is fluent, it is spoken easily and without many pauses.(语言)讲得流利的
More examples
She's fluent in French and English and has a working knowledge of Spanish.
She was born in Italy but her English is fluent and idiomatic.
I can make myself understood in French, but I'm not fluent.
My partner is a fluent Russian speaker.
He knows quite a lot of French, but he's not fluent yet.
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