图6展示了第二轮和第三轮迭代的对比。

Figure 6 shows a comparison to the process from the second iteration to the third.

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对于双向同步，将执行此进程两次，第二次迭代时会交换源和目标。

For bidirectional synchronization, this process will be executed twice; source and destination swapped on the second iteration.

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第二部分代表迭代或递归。

The second part represents the iteration or recursion.

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