發送短信

數:

提供者:

CAPTCHA:

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

Please enter what you see:

發送短信 : Seasonality and dynamic spatial contagion of air pollution in 42 Chinese cities