發送短信 : Knowledge producers and consumers

             ___     _    _      ___     _    _   
  ____      / _ \\  | \  / ||   / _ \\  | || | || 
 |    \\   | / \ || |  \/  ||  | / \ || | || | || 
 | [] ||   | \_/ || | .  . ||  | \_/ || | \\_/ || 
 |  __//    \___//  |_|\/|_||   \___//   \____//  
 |_|`-`     `---`   `-`  `-`    `---`     `---`   
 `-`