發送短信 : On the simplified expression of realistic raindrop shapes

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