發送短信

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  _  _     ______    ____      ______    ____    
 | \| ||  /_   _//  |  _ \\   /_   _//  |  _ \\  
 |  ' ||   -| ||-   | |_| ||   -| ||-   | |_| || 
 | .  ||   _| ||_   | .  //    _| ||_   | .  //  
 |_|\_||  /_____//  |_|\_\\   /_____//  |_|\_\\  
 `-` -`   `-----`   `-` --`   `-----`   `-` --`

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發送短信 : An exploratory analysis of confusion among students using Newton's playground