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.
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。
Before I knew you, I told Zhipeng that I did not know how to prepare the materials needed for a visa and he gladly introduced you to me for you had been studying in Australia for one year.
当初志鹏当说我很多出国的材料不会弄，他就介绍了你给我认识，因为你曾经在澳大利亚读过一年书。
There is that day you made a visit or called someone to show how much you cared, or simply saying I love you to someone who needed it or contributing to assist disaster survivors.
某天你很关心地去探望某人，或对需要关爱的人简单地说声“我爱你”； 亦或是你援助了那些经历过灾难的人们。
You see I buried my wife, the love of my life just a few short years ago and watched her slowly fade away. I needed to get a message of hope to this girl. But how? What could I do?
你明白几年前我亲手埋葬了我的妻子，我的爱，并看着她慢慢在消失。我希望得到这姑娘的一点消息。但是怎样？我该怎么做？
You see I buried my wife, the love of my life just a few short years ago and watched her slowly fade away. I needed to get a message of hope to this girl. But how? What could I do?
你明白几年前我亲手埋葬了我的妻子，我的爱，并看着她慢慢在消失。我希望得到这姑娘的一点消息。但是怎样？我该怎么做？
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