Noise in communication system is usually considered a nuisance.

通信系统中的噪声通常被认为是有害的现象。

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In a communication system, the decrease of noise is very important problem.

在通信系统中，降低噪声是一个非常重要的问题。

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In a communication system, the decrease of noise is very important problem.

在通信系统中，降低噪声是一个非常重要的问题。

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