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Sigma KEE - TelephoneSystem
电话系统
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A TelephoneSystem consists of a complete interconnection of Telephones, MainTelephoneLines, and other components that work together to make telephonic communication possible from point to point in a given area.
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通讯系统 |
CommunicationSystem is a complex system with various components, enabling communication (in some medium) between points in a specific area, whether local or worldwide.
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