On the return trip, the reverse path becomes the forward message path.

在返回的途中，反向路径变成正向消息路径。

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If the rev element is present, the reverse message path is built dynamically when the message travels along the forward message path.

如果出现了rev元素，当消息沿转发消息路径传送时，动态构建反向消息路径。

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FWD describes the forward message path and rev describes the reverse message path; the latter is optional.

fwd描述转发消息路径，rev描述反向消息路径；后者是可选的。

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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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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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