linguist
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.
Officials used to have trouble with the foreign names of people passing through Ellis Island, and because they were so busy, many people's names got changed in the rush.