be fluent in"表示对某语言或技能达到 自然流畅、精准表达的掌握状态，“精通某某技能、精通某某语言、某某语言说得流利，某某语言说得十分流利，熟练掌握”等，例句：
She is fluent in German.
她的德语很流利。
She's fluent in Polish.
她的波兰语很流利。
She studied eight foreign languages but is fluent in only six of them
她学习了8种外语，但是只能流利地说其中6种。
She was fluent in French by the time she was five.
她五岁时法语已说得十分流利。
The CEO's fluent Mandarin impressed the Chinese delegation during the trade talks.
CEO流利的普通话在贸易谈判中给中国代表团留下深刻印象。
He was fluent in Spanish before moving to Mexico.
移居墨西哥前，他西班牙语很流利。
She has been fluent in Japanese since graduating from university.
自大学毕业后，她日语一直很流利。
My friend is fluent in internet slang, which makes her social media posts super engaging.
我朋友精通网络俚语，这让她的社交媒体帖子非常吸引人。
Are you fluent in sign language? It would be a valuable skill for this job.
你精通手语吗？这对这份工作很有价值。
He is not fluent in Japanese yet, but he can hold basic conversations.
他日语尚未流利，但能进行基本对话。
She was born in Italy but her English is fluent and idiomatic.
她出生于意大利，但英语流利且地道。
He had become fluent in German during the Wehrmacht's occupation of Estonia in 1942.
1942年德军占领爱沙尼亚期间，他学会了一口流利的德语。
It is doubtful whether Ted, even with his fluent French, passed for one of the locals.
尽管特德法语流利，但他是否能被当成当地人仍值得怀疑。
She was immediately attracted to him because he was fluent in French, which she found incredibly romantic.
她立刻被他吸引，因为他流利的法语让她觉得无比浪漫。
After living in France for years, my parents are fluent in French, which helps them communicate with our relatives there.
在法国生活多年后，父母法语流利，这有助于他们与当地亲戚交流。
He was fluent in French, having spent stretches of time in Southern France.
他曾在法国南部呆过一段时间，法语流利。
His ability to be fluent in both Mandarin and English made him the ideal bridge between our Chinese and American teams.
他流利的中英双语能力使他成为中美团队间的理想沟通桥梁。
The hotel staff should be fluent in multiple languages to assist international guests.
酒店员工需流利掌握多语言以服务国际宾客。
The ambassador must be fluent in the host country's language to effectively communicate with local officials.
大使必须流利掌握驻在国语言以与当地官员高效沟通。
The trade agreement requires both parties to be fluent in the terms and conditions to avoid misunderstandings.
贸易协定要求双方熟练掌握条款内容以避免误解。
He is fluent in computer programming.
他精通计算机编程。
I'm fluent in four languages and can wrestle with a menu in five more. 《致胜王牌》（美剧）
我精通四国语言，还能应付另外五种语言的菜单。
Judy Hopps, the rabbit cop, is fluent in mammal sign language to communicate with all species. 《疯狂动物城》（电影）
兔子警官朱迪·霍普斯精通哺乳动物手语，能与所有物种交流。
Princess Ann: "I must say I'm quite fluent in all the diplomatic niceties... but sometimes I just want to say what I feel." 《罗马假日》（电影）
安妮公主：“我必须承认我精通所有外交辞令……但有时我只想说出我的感受。”）
注意： 混淆 "fluent" 与 "proficient"
- Fluent 强调 表达流畅性和精通的程度，proficient 侧重 综合能力熟练。
- 正确示例：
She is proficient in French (can read, write, speak), but not yet fluent.
她法语熟练，但尚未达到流利水平。
