以下为句子列表：
英文: Digital program-controlled telephone switching system project (6,000 lines and trunks) Pingyao telecom bureau, Shanxi province.
中文: 陕西电信西安小寨局20000门程控交换机开通工程。
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英文: For a matrix, the number of RF relays and cables required to construct a given switching system (and therefore, its cost) is geometrically relatted to the number of system inputs and outputs.
中文: 对于矩阵，构建特定的切换系统所需的RF继电器及电缆数量（进一步说，所需的费用）与系统的输入和输出数量成几何关系。
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