FAQs About the word pen pal

笔友

a person you come to know by frequent friendly correspondence

同位元,助理,血兄弟,伙计,伙伴,同事,弟兄,同志,知己,密友

敌人,敌人,对手,拮抗剂,竞争者,对手,竞争对手,死敌,克星

pen nib => 笔尖, pen name => 笔名, pen => 笔, pemphigus => 寻常型天疱疮, pemphigous => 大疱性类天疱疮,