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            ______    ____       ___       _____  
  ____     /_   _//  |  _ \\    / _ \\    / ___// 
 |    \\    -| ||-   | |_| ||  | / \ ||   \___ \\ 
 | [] ||    _| ||_   | .  //   | \_/ ||   /    // 
 |  __//   /_____//  |_|\_\\    \___//   /____//  
 |_|`-`    `-----`   `-` --`    `---`   `-----`   
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發送短信 : Design of a teaching smart prototype product