發送短信 : How the attitude of commuters affects the effectiveness of natural surveillance in MRT stations.

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