Abstract: in the process of the transmission of the engineering culture, transmission path and transmission rules are two important aspects, they decide the result of cultural transmission.
[摘要]文化的传播过程中，传播路径与传播规则是两个重要方面，它们共同决定文化传播的结果。
Traditionally, such a circuit was provisioned through the use of two copper pairs, one for transmission ( forward path , or upstream path ) and one for reception ( reverse path , or downstream path );
传统上，这种电路通过使用两个铜电缆对提供，一个用于发送（前向路径或上游路径）、一个用于接收（反向路径或下游路径）。
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