發送短信

數:

提供者:

CAPTCHA:

 _    _    _    _     ______   _    _     ______  
| |  | || | || | ||  /_   _// | || | ||  /_   _// 
| |/\| || | || | ||  `-| |,-  | || | ||  `-| |,-  
|  /\  || | \\_/ ||    | ||   | \\_/ ||    | ||   
|_// \_||  \____//     |_||    \____//     |_||   
`-`   `-`   `---`      `-`'     `---`      `-`'

Please enter what you see:

發送短信 : A bad plan is better than no plan: A theoretical justification of an empirical observation