书信是亲友之间交流信息、沟通情况的媒介。它又称书简、书札、尺牍、便函。书信的内容无所不包,或言近况,或抒怀抱,或告秘情,或发议论,或表理想,或述观点。在电话、手机、电脑没有发明之前,人们传递音信、联络感情的主要方式靠信函。杜甫在《春望》中说:“烽火连三月,家书抵万金。”战争岁月,能收到一封家信,真比得到万金还要高兴。万里外的游子,突然接到一封报平安的亲人来 Correspondence is a medium for exchanging information and communication between relatives and friends. It is also known as Book, Book, Ruler, memo. The content of the letter is all-encompassing, or the recent situation, or express their embrace, or to tell the secret, or send arguments, or table ideal, or statement. Before telephones, cell phones, and computers were invented, people sent letters, and the main ways to contact them were by letter. Du Fu said in his book “Spring Hope”: “The flames of war even in March, the book arrived in Mankin.” "Years of war, can receive a letter from the family, really than happy to get million gold. Wandering wanderer, suddenly received a report to relatives peace come