epistolary
adj
(fml 文) of, carried on by, or written in the form of letters 书信的; 用书信进行的; 书信体的
an epistolary friendship 书来信往的友谊
an epistolary novel 书信体小说.
🗣️ 情景例句
When my girlfriend rings me out of the blue, I'm in a good mood for the rest of the day.