wherein the cover panel comprises at least one connecting region, in which connecting region, the cover panel is connected to {HEAD ~ the supporting panel}, and at least one absorption region, in which absorption region, the cover panel is configured to oscillate with respect to {TAIL ~ the supporting panel} 
wherein the cover panel comprises at least one connecting region , in which connecting region , the cover panel is connected to { HEAD ~ the supporting panel } , and at least one absorption region , in which absorption region , the cover panel is configured to oscillate with respect to { TAIL ~ the supporting panel }
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL