求翻译：在自由排气阶段，排气门处会由于高速的气流喷注而产生强烈的喷注噪声。又由于气体的粘性，废气排出后会带动排气门后的气体一起运动产生卷吸作用，使周围气体发生旋转，形成涡流，辐射出涡流噪声。另外，排气门附近存在着气体压力的不连续面。这种压力不连续会产生冲击波，因而产生冲击噪声。是什么意思？

In a free exhaust phase, exhaust valve at the speed of the airflow due to a strong jet and jet noise. Also, because the gas viscosity, gas emissions will drive along the gas exhaust valve movement after entrainment, so that the surrounding gas is rotated, the formation of eddy current, eddy current

In a free exhaust phase Gate and the exhaust air stream will result in high-speed injection and have created a strong injection noise. And as a result the viscous, gas emissions will be driven by exhaust gases after door with movement to generate volume suck gas ball spins around, forming a vortex E

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In a free exhaust, exhaust valves will be strong because of high speed air jet Jet noise. And because the viscosity of the gas, exhaust discharges after driven exhaust valve of gas movement after juanxizuoyong, lead to rotation of ambient gas, formation of vortex, Vortex noise radiation out. In addi

In a free exhaust, exhaust valves will be strong because of high speed air jet Jet noise. And because the viscosity of the gas, exhaust discharges after driven exhaust valve of gas movement after juanxizuoyong, lead to rotation of ambient gas, formation of vortex, Vortex noise radiation out. In addi