英語：pen pal.
例如：
I have a pen pal who is a student and lives in England.
We often talk about our school life by email.
He learns Chinese from me and I learn English from him,
英語：pen pal.
例如：
I have a pen pal who is a student and lives in England.
We often talk about our school life by email.
He learns Chinese from me and I learn English from him,