Thereby, the combustion noise radiated from the exhaust outlet is reduced for all the directions, and at the same time {HEAD ~ the combustion noise} is reduced with {TAIL ~ a sufficient accuracy} corresponding to variations of the combustion noise characteristics 
is reduced with
Thereby , the combustion noise radiated from the exhaust outlet is reduced for all the directions , and at the same time { HEAD ~ the combustion noise } is reduced with { TAIL ~ a sufficient accuracy } corresponding to variations of the combustion noise characteristics
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH