發送短信 : A note on the monotonicity of the ES-algorithm

  _____     _____    __   __    ______            
 |__  //   |  ___||  \ \\/ //  /_   _//   ____    
   / //    | ||__     \   //    -| ||-   |    \\  
  / //__   | ||__     / . \\    _| ||_   | [] ||  
 /_____||  |_____||  /_//\_\\  /_____//  |  __//  
 `-----`   `-----`   `-`  --`  `-----`   |_|`-`   
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