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 _____      _____    _    _    _    _             
|  __ \\   |  ___|| | \  / || | || | ||     ___   
| |  \ ||  | ||__   |  \/  || | || | ||    /   || 
| |__/ ||  | ||__   | .  . || | \\_/ ||   | [] || 
|_____//   |_____|| |_|\/|_||  \____//     \__ || 
 -----`    `-----`  `-`  `-`    `---`       -|_|| 
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發送短信 : Some Notes on the Total Service Time in Certain Loss Systems