發送短信 : Welcome to sales management: Addition by subtraction?

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