However, since the concentration of the polar vinyl compound is low, the pressure crystallization must be performed at further lower temperatures, thereby bringing about {HEAD ~ a further decrease} in {TAIL ~ separation efficiency} 
However , since the concentration of the polar vinyl compound is low , the pressure crystallization must be performed at further lower temperatures , thereby bringing about { HEAD ~ a further decrease } in { TAIL ~ separation efficiency }
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 REL TAIL TAIL TAIL TAIL TAIL TAIL