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

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發送短信 : Motion of a bubble ring in a viscous fluid