Therefore, when the vehicle ascends {HEAD ~ 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 {TAIL ~ stalling} of the engine 
Therefore , when the vehicle ascends { HEAD ~ 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 { TAIL ~ stalling } of the engine
OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD 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 TAIL TAIL TAIL TAIL TAIL OTH OTH OTH