發送短信 : The effect of leaderboard in different goal-setting levels

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