pen pal

笔友英释中释someone you make friends with by writing letters, especially someone who lives in another country and who you have never met

1 She: In my high school French class, there was a pen pal requirement..她 ：在高中的法语课上，要求每个人交一名笔友。

2 You can also find a pen pal or an online community that will let you ask questions and talk to others who are learning French..你也可以找个笔友，或是在网上找一个能让你问问题和与他人交流法语学习经验的论坛社区。