The nontransparent hollow tube has {HEAD ~ inner and outer surfaces} that define {TAIL ~ a wall} of the hollow tube 
define
The nontransparent hollow tube has { HEAD ~ inner and outer surfaces } that define { TAIL ~ a wall } of the hollow tube
OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH