Under these circumstances, the first and the second supporting members are fixed to the first and the second axles respectively, and {HEAD ~ the first and the second axles} can provide {TAIL ~ pivoting activities} 
provide
Under these circumstances , the first and the second supporting members are fixed to the first and the second axles respectively , and { HEAD ~ the first and the second axles } can provide { TAIL ~ pivoting activities }
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 HEAD HEAD HEAD OTH REL TAIL TAIL TAIL TAIL TAIL TAIL