The carbon nanotube film includes {HEAD ~ a number} of {TAIL ~ carbon nanotube strings} substantially parallel to each other and extending along a first direction 
of
The carbon nanotube film includes { HEAD ~ a number } of { TAIL ~ carbon nanotube strings } substantially parallel to each other and extending along a first direction
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH