發送短信 : Ideal invisibility cloak for heat flow

            _____    ______      ___      ______  
    ___    |  ___|| |      \\   / _ \\   /_   _// 
   /   ||  | ||__   |  --  //  | / \ ||    | ||   
  | [] ||  | ||__   |  --  \\  | \_/ ||   _| ||   
   \__ ||  |_____|| |______//   \___//   /__//    
    -|_||  `-----`  `------`    `---`    `--`     
     `-`