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 __   __    ______              ______            
 \ \\/ //  /_   _//   ____     /_   _//   ____    
  \   //    -| ||-   |    \\    -| ||-   |    \\  
  / . \\    _| ||_   | [] ||    _| ||_   | [] ||  
 /_//\_\\  /_____//  |  __//   /_____//  |  __//  
 `-`  --`  `-----`   |_|`-`    `-----`   |_|`-`   
                     `-`                 `-`

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發送短信 : Students' conceptual and procedural understanding of conic sections through online guided discovery learning