以下为句子列表：
英文: Within a communication system the information transfer is frequently achieved by superimposing or modulating the information on to an electromagnetic wave which acts as a carrier for the information signal.
中文: 在通信系统中,信息传递通常是通过把信息叠加,调制,加到一个充当信息信号传输载体的电磁波上来完成的.
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