發送短信 : On the role of update constraints and text-types in iterative learning

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 /_____//   / _ \\   /  ___||   / _ \\  | || | || 
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 /___//    | \_/ || | \\_\ ||  | \_/ || | \\_/ || 
 `__ `      \___//   \____//    \___//   \____//  
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