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