發送短信

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

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發送短信 : An Equivalent Definition for the Backwards Ito Integral