Finally algorithms for removing difficult visitable in postorder threaded binary trees are given.

给出了消除二叉后序线索树中困难访问的算法。

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Rome's mild climate makes it visitable year-round; however, spring and autumn are without doubt the best times to visit, with generally sunny skies and mild temperatures.

罗马温和的气候使得它全年都适合旅行，然而，春季和秋季是毫无疑问的最好时间，因为这时候有温和晴朗的天空和适宜的温度。

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