这棵树是那棵树高度的两倍。

This tree is twice the height of that one.

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看看你周围的树。有些树的高度超过100米。

Look at the trees around you. Some trees are over 100 meters tall.

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这减少了迭代过程中的内存占用，因为堆栈深度始终保持一致，而不依赖于树的高度。

This reduces memory usage during the iteration because the stack depth is constant instead of dependent on the height of the tree.

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