發送短信 : A compact 2 degree-of-freedom energy harvester with cut-out cantilever beam

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