用应用软件与线路入口时，所有的包都按 地址送给入口上的用户 级应用程序，入口在两点间转送这些包。

With application and circuit gateways, all packets are addressed to a user-level application on a gateway that relays packets between two points.

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越狱从地下室开始，这条线路是从暖气室的一个出入口通到这个管道系统。

It all starts in the basement. This line leads from a hatch in the coal room to this pipe system here.

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我们逐个中心解决(地铁通道总是不畅通)，而其它的人分配到其它交通工具规划上，包括停放位置是否恰当、规划抵达出入口的线路等。

We work from center to center (the metro channel is always inflexible) and the remainder is distributed to other vehicles parked where appropriate, and routes to reach the thresholds.

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