發送短信 : Indexing for moving objects

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