發送短信 : Knowledge producers and consumers

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