Noise is transient; once the pollution stops, the environment is free of it.
另处，物理性污染没有后效作用，即噪声不会残存在环境中，噪声停止，污染立即消失。
Good seal, no pollution of the environment, easy operation and low noise.
密封性好，对作业环境无污染，操作方便，噪音低。
Noise is one of the main problems resulting in city environment pollution.
噪声污染扰民是城区环境污染的主要问题之一。
Noise is one of the main problems resulting in city environment pollution.
噪声污染扰民是城区环境污染的主要问题之一。
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