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 \ \\/ //  |  ___|| | || | ||   / _ \\      ___   
  \   //   | ||__   | '--' ||  | / \ ||    /   || 
  / . \\   | ||__   | .--. ||  | \_/ ||   | [] || 
 /_//\_\\  |_____|| |_|| |_||   \___//     \__ || 
 `-`  --`  `-----`  `-`  `-`    `---`       -|_|| 
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發送短信 : Limitations of high-order transformation and incident angle on simplified invisibility cloaks