發送短信 : Cooling of liquid in a tube under rotation

  ______    _____    _    _      ___      ______  
 /_   _//  |  ___|| | |  | ||   / _ \\   /_   _// 
 `-| |,-   | ||__   | |/\| ||  | / \ ||    | ||   
   | ||    | ||__   |  /\  ||  | \_/ ||   _| ||   
   |_||    |_____|| |_// \_||   \___//   /__//    
   `-`'    `-----`  `-`   `-`   `---`    `--`