أرسل هذا في رسالة قصيرة: Structural responses of secondary lining of high-speed railway tunnel excavated in loess ground

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