發送短信

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

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發送短信 : An introduction to queueing theory : modeling and analysis in applications