發送短信 : Installation stress in prefabricated vertical drains

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