私有地址在外地分层代理可以使用，并且不需要向移动接点说明这种分层结构的外地代理。
Private addresses can be used in the foreign agent hierarchy while not revealing it to the mobile node providing a privacy of hierarchy.
内部传输（当前实现中的连接点）仅移动缓冲区，并且不知道它们的内部表示。
The internal transport (rings in the current implementation) move only buffers and have no knowledge of their internal representation.
便于移动和重新配置跳接点的接线板、搂插线、底板系统。
Facilitating shift and new configuration jump contact wiring board, cuddle inserts system of line, motherboard.
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