發送短信

數:

提供者:

CAPTCHA:

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

Please enter what you see:

發送短信 : Do It Today or Do It Tomorrow: Empirical Non-exponential Discounting Explained by Symmetry Ideas