發送短信 : Hollow carbon spheres with a controllable shell structure

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