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  _  __     ___      _  __   _    _     _____   
 | |/ //   / _ \\   | |/ // | || | ||  / ____|| 
 | ' //   / //\ \\  | ' //  | || | || / //---`' 
 | . \\  |  ___  || | . \\  | \\_/ || \ \\___   
 |_|\_\\ |_||  |_|| |_|\_\\  \____//   \_____|| 
 `-` --` `-`   `-`  `-` --`   `---`     `----`

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發送短信 : Uncertain performance expectations in satisfaction models for services