A carpet of fallen leave beneath nearly bare trees, with green grass in the background serving as a memory of the summer gone by.

在几乎光秃秃树下，落叶像地毯一样铺在地上，背景里的绿色草地，留下了逝去的夏天的回忆。

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The above photo shows a carpet of fallen leave beneath nearly bare trees, with green grass in the background serving as a memory of summer gone by.

上面的这张照片显示了在几乎光秃秃树木下的落叶地毯，背景里的绿色草地，留下了已经过时的夏天记忆。

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But in the case of larger trees, we might prefer to traverse iteratively, in order to preserve memory.

但对于较大的树来说，我们更希望以迭代的方式遍历，从而节约内存。

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