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

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