他有一种学者的风度，而且是个熟练掌握多国语言的人。

He had a scholarly air and was an accomplished linguist.

《柯林斯英汉双解大词典》

他熟练掌握了好几种现代语言。

He had a good grip of several modern languages.

youdao

如果熟练掌握三种甚至更多的语言，是不是能获得三倍甚至更大的益处呢？

If you speak three or more languages fluently, will you be three or more times better off?

youdao

How many of you know more than one language pretty fluently?

你们有多少人能熟练掌握不止一门语言

耶鲁公开课 - 心理学导论课程节选