基本解释再见（在电子邮件结尾与人道别时的说法，ta-ta for now的缩写）。同根派生 ttfn相关词英英字典剑桥英英字典 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