linguist
/ˈlɪŋgwɪst; `lɪŋɡwɪst/ n
1 person who knows several foreign languages well 通晓数国语言的人
She's an excellent linguist. 她精通数国语言.
I'm afraid I'm no linguist, ie I am poor at foreign languages. 我不懂外国语.
2 person who studies language(s) scientifically 语言学家.