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

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發送短信 : Reverse-saturated absorption and narrow line in the absorption spectrum of a V-type three-level medium