FAQs About the word pen pals

笔友

a friend made and kept through letter-writing, a friend made and kept through correspondence

替身,朋友,伙伴,结拜兄弟,兄弟,伙伴,朋友,同事,伙计,同志们

竞争者,敌人,敌人,对手,对手,拮抗剂,对手,死敌

pen names => 笔名, pelts => 皮毛, pelletizing => 造粒, pelletize => 制粒, pelleting => 制粒,