基本解释再見（在電子郵件結尾與人道別時的說法，ta-ta for now的縮寫）。同根派生 ttfn相关词英英字典劍橋英英字典 written abbreviation for ta-ta for now: a way of saying goodbye at the end of an emailttfn剑桥字典ttfn柯林斯字典