發送短信 : Faxen's laws of a composite sphere under creeping flow conditions

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