Therefore, when the vehicle ascends a slope or when the vehicle is heavily weighed , the engine rotary speed surely arises to a sufficient value before the shift up of the multi speed transmission, thereby preventing {HEAD ~ stalling} of {TAIL ~ the engine} 
Therefore , when the vehicle ascends a slope or when the vehicle is heavily weighed , the engine rotary speed surely arises to a sufficient value before the shift up of the multi speed transmission , thereby preventing { HEAD ~ stalling } of { TAIL ~ the engine }
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 OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD REL TAIL TAIL TAIL TAIL TAIL TAIL