我国最早的书信叫“尺牍”,因古时书简约长一尺而得名。它是由两块木简或竹简组成,下面一块写信的内容。上面一块写收信人和寄信人地址及姓名,即为信封。将两块简用绳子扎牢托人投寄。另一种信件是用绿绸为原料,叫“尺素书”,把信的内容写在绢帛上,夹在刻有鲤鱼状的木板中间,故又叫“鱼书”、“鲤封”,这两块木板就是信封。古希腊则是用奴隶的头发做 The earliest letters in our country are called “牍 牍”, because ancient books were short and long and named. It consists of two pieces of wood or bamboo slips, the following piece of writing the content. Above write a copy of the recipient and sender address and name, is the envelope. Put two pieces of simple rope tied to the trustees post. Another letter is made of green silk as raw material, called “Sizu Shu”, the contents of the letter written in silk silk, carved in the middle of carved wooden board, it is also called “fish book”, “carp seal” The two boards are envelopes. Ancient Greece is made with slave hair