I don't know how strong I'll be if I move to a foreign country and try to speak in another language with fluent speakers.

我不知道如果我到另一个国家，和另一种语言努力地跟那些说话流利的人交流，那时我会有多坚强。

youdao

In order to achieve this final aim, productive vocabulary and fluent usage of all grammatical rules in sentences making become especially important in learning a foreign language.

为了达到语言学习的这一终极目的，增加产出性词汇量，把语法知识熟练地应用于话语产出中就变得尤其重要。

youdao

A diplomat should be fluent in foreign language.

外交官的外语，应该要流利。

youdao

Years ago, you needed a nursing qualification and be fluent in a foreign language in order to work for BA. But now, customer service experience is low and staff only stay for a short period of time.

BBC: BA Christmas strikes: Staff reaction