FAQs About the word pen pal

筆友

a person you come to know by frequent friendly correspondence

同位元,助理,血兄弟,夥計,夥伴,同事,兄弟,同志,知己,密友

敵人,敵人,對手,拮抗劑,競爭者,對手,競爭對手,死敵,克星

pen nib => 筆尖, pen name => 筆名, pen => 筆, pemphigus => 尋常性天疱瘡, pemphigous => 大疱性類天疱瘡,