节点重新连接之后，可使用这些位图快速同步节点，彼此之间进行精确的复制。

When the nodes are reconnected, synchronization can use this bitmap to quickly synchronize the nodes to be exact replicas of one another.

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连接的重新传输计时器首次计时到期，或者打开了快速重新传输阶段。

Retransmission timer expires for a connection for the first time or the fast retransmit phase is turned on.

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对于某个连接，打开了快速重新传输阶段。

Fast-retransmit phase is turned on for a connection.

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