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 \ \\/ //   / _ \\   |  _ \\   \ \\/ //  |__  //  
  \   //   | / \ ||  | |_| ||   \ ` //     / //   
  / . \\   | \_/ ||  | .  //     | ||     / //__  
 /_//\_\\   \___//   |_|\_\\     |_||    /_____|| 
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發送短信 : Modeling of the movement and stress distribution of a line-shaped item in a vortex