FAQs About the word pen pals

筆友

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

替身,朋友,夥伴,結拜兄弟,兄弟,夥伴,朋友,同事,夥計,同志們

競爭者,敵人,敵人,對手,對手,拮抗劑,對手,死敵

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