注意，这个缓存对于您使用的特定遍历算法并不真正需要，我在这里使用它只是为了展示当您将来需要扩展这个工具时应该怎样做。
Note the caching is not really required for the particular traversal algorithm you are using, but I leave it in to show how to do this if it is needed as you expand this tool in the future.
朱诺·麦高夫：我想生下这个孩子，然后送给真正需要的人去抚养。
Juno MacGuff: I could like, have this baby and give it to someone who like totally needs it.
朱诺·麦高夫：我想生下这个孩子，然后送给真正需要的人去抚养。
Juno MacGuff: I could like, have this baby and give it to someone who like totally needs it.
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