أرسل هذا في رسالة قصيرة: Surface modification of Al-Zn-Mg alloy by combined electrical discharge machining with ball burnish machining

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