attaching the carbon nanotube film on two elastic supporters parallel with and spaced from each other, and extending along the second direction, wherein a portion of the carbon nanotube film between {HEAD ~ the two elastic supporters} is suspended after the carbon nanotube film is attached to {TAIL ~ the two elastic supporters}; and 
attaching the carbon nanotube film on two elastic supporters parallel with and spaced from each other , and extending along the second direction , wherein a portion of the carbon nanotube film between { HEAD ~ the two elastic supporters } is suspended after the carbon nanotube film is attached to { TAIL ~ the two elastic supporters } ; and
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH 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 HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH