The first main body and {HEAD ~ the first lens portion} are made of {TAIL ~ a same polymer material} having a lower melting point and higher fluidity than polyether imide 
are made of
The first main body and { HEAD ~ the first lens portion } are made of { TAIL ~ a same polymer material } having a lower melting point and higher fluidity than polyether imide
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH