Definition: someone who you write to regularly but have never met Level: A2
我有一个笔友住在英国。
I have a ___penfriend who lives in the UK.
她通过写信和她的笔友交流。
She communicates with her ___penfriend by writing letters.
我的笔友给我寄了一张明信片。
My ___penfriend sent me a postcard.
