發送短信 : Some properties almost - periodic solution of linear differential equations

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