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

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發送短信 : On kirchhoff's model of parabolic type