1.万能的用法是：Yours sincerely, 或 Sincerely yours, 最方便，什么信件都适用哦。
2.私人信件中可以用：Best wishes, Best regards, Best, Regards, Warmesr regards, Yours ever, Yours, Cordially
4.公务信件的话，一般可以用：Yours faithfully, Yours trully, Yours respectfully, Yours gratefully, Yours cordially
