使用者如果在日志中向后巡览，可以变更巡览顺序。
Users can change the navigation sequence if they navigate back through the journal.
向后巡览下拉式清单、指向目前图形，然后选取节点。
Navigate Backward drop-down list, point to the current graph, and then select a node.
这个问题会不断扩大，因为并没有限制在巡览记录的向后及向前堆叠中，能够储存多少项目。
This problem is augmented by the fact that there is no limit to the number of entries that can be stored in the back and forward stacks of navigation history.
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