{HEAD ~ The opening and closing valve} is disposed swingably in {TAIL ~ the second intake air passage} so as to open and close the second intake air passage 
is disposed swingably in
{ HEAD ~ The opening and closing valve } is disposed swingably in { TAIL ~ the second intake air passage } so as to open and close the second intake air passage
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH