“土生土长” 用英语怎么样说。书面一些。

be born and brought up on one's native soil
或者是
locally born and bred

native

他意大利语很厉害，所以我就理所当然地把他当成了土生土长的意大利人。
I take it for granted that he is a native Italian because he speaks Italian so well.

Indigenous

be born and brought up on one's native soil
或者是
locally born and bred

Tu sheng tu zhang .