發送短信 : Hierarchical document representation for summarization

 __   __    _____    _    _     _____     ____    
 \ \\/ //  |  ___|| | |  | ||  |  ___||  |  _ \\  
  \   //   | ||__   | |/\| ||  | ||__    | |_| || 
  / . \\   | ||__   |  /\  ||  | ||__    | .  //  
 /_//\_\\  |_____|| |_// \_||  |_____||  |_|\_\\  
 `-`  --`  `-----`  `-`   `-`  `-----`   `-` --`