the noise of engine 发动机噪声
The engine noise rises only slightly as I speed along.
我一路高速行驶时,发动机的噪音只提高了一点点。
So a direct method to reduce the engine noise is to insulate the exterior radiation noise.
因此对发动机进行降噪一个直接的方法就是对表面噪声进行屏蔽。
Because the hydraulic valve plunger automatic control valve clearance is zero gap, simultaneously may reduce the engine noise.
由于液压挺杆自动调节气门间隙为零间隙,同时可降低发动机噪声。
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