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            _____   __    __     ___      _____   
    ___    |  ___|| \ \\ / //   / _ \\   /  ___|| 
   /   ||  | ||__    \ \/ //   / //\ \\ | // __   
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   \__ ||  |_____||    \//    |_||  |_|| \____//  
    -|_||  `-----`      `     `-`   `-`   `---`   
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發送短信 : Third order nonlinear optical property of Bi2Se3