If {HEAD ~ a shock} greater than the ordinary shock is given to {TAIL ~ the internal gear} 3, according to the flexibility of the internal gear 3, it flexes itself radially to absorb the shock 
is given to
If { HEAD ~ a shock } greater than the ordinary shock is given to { TAIL ~ the internal gear } 3 , according to the flexibility of the internal gear 3 , it flexes itself radially to absorb the shock
OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH