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

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發送短信 : Interactions between circular vortex-rings and free-surfaces