fluent
她法语很流利。
She's ___fluent in French.
他俄语说得很流利。
He's a ___fluent Russian speaker.
我法语和英语都很流利。
I am ___fluent in French and English.
她的日语很流利。
She is ___fluent in Japanese.
他的书面法语异常流畅。
His written French is remarkably ___fluent.
经过多年的学习，他现在能说一口流利的意大利语。
After years of study, he can now speak ___fluent Italian.