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

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發送短信 : Effects of surface texture on flow in channels