摩托车的曲轴箱盖是发动机的主要构件，在摩托车发动机运转时，会受到曲轴作用的激振力而发生振动向外辐射噪声。
Motorcycle's crankcase cover plate is its engine's major component, which would vibrate to radiate noise under the force of the crankcase when the motorcycle'sengine operates.
新鲜空气进口一般是曲轴箱通气盖。
The fresh - air inlet was usually the crankcase breather cap.
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