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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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.

youdao

出去买树之前，应该量一量放树的房间房顶的高度。

Before you go tree shopping, measure the height of the ceiling in the room where you will display your tree.

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