發送短信 : Utilization of standing waves to improve effectiveness of noise barriers

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