native speaker
person who has spoken (a particular language) since birth, rather than learning it later 生來就說某種語言的人
a native speaker of French, Italian, etc 生來就說法語、 意大利語等的人
Her English accent is so good, you would think she was a native speaker. 她的英語口音很純正, 誰都以為她生來就說英語.