{HEAD ~ The air intake passage} is arranged to introduce {TAIL ~ air} to the chamber through a throttle valve for regulating an amount of the air with an opening degree thereof 
{ HEAD ~ The air intake passage } is arranged to introduce { TAIL ~ air } to the chamber through a throttle valve for regulating an amount of the air with an opening degree thereof
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH