{HEAD ~ An intake air duct} serves as a passage for supplying air to an engine, and includes a first intake air passage, {TAIL ~ a second intake air passage}, an opening and closing valve, an interlocking member and a coiled spring 
includes
{ HEAD ~ An intake air duct } serves as a passage for supplying air to an engine , and includes a first intake air passage , { TAIL ~ a second intake air passage } , an opening and closing valve , an interlocking member and a coiled spring
HEAD HEAD HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH REL OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH