發送短信 : Energy-efficient vacuum systems

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