笔友bǐyǒuMeanings1. pen palCharacters used笔writing brush友friendExamples1她tā每měi两liǎng个gè月yuè给gěi在zài伦敦Lúndūn的de笔友bǐyǒu写xiě一yī封fēng信xìn。She writes to her pen pal in London twice a month.