{HEAD ~ Each} of the light incidence end and the light emitting end of the mirror light guide component is either an opening or {TAIL ~ a transparent layer} 
is
{ HEAD ~ Each } of the light incidence end and the light emitting end of the mirror light guide component is either an opening or { TAIL ~ a transparent layer }
HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL