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