發送短信 : Structural health monitoring of tunnel liners

 _    _      ___      ______     ___      _  __  
| || | ||   / _ \\   /_   _//   / _ \\   | |/ // 
| || | ||  / //\ \\    | ||    | / \ ||  | ' //  
| \\_/ || |  ___  ||  _| ||    | \_/ ||  | . \\  
 \____//  |_||  |_|| /__//      \___//   |_|\_\\ 
  `---`   `-`   `-`  `--`       `---`    `-` --`