{TAIL ~ The apparatus} 1, wherein said apparatus further comprising an air adjustment means provided in the inlet portion of said air inlet passage for adjusting the amount of the air introducing into {HEAD ~ the combustion chamber} and the swirling force 
{ TAIL ~ The apparatus } 1 , wherein said apparatus further comprising an air adjustment means provided in the inlet portion of said air inlet passage for adjusting the amount of the air introducing into { HEAD ~ the combustion chamber } and the swirling force
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