这种感觉只与地理有关，所以我们所处之地的高度、宽度以及深度总会让我们想起某个地方。

This feeling has to do solely with geography, so something about the height, width, and depth of wherever we are reminds us of somewhere else.

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艺术家们高度熟练地使用，甚至增强了洞穴墙壁的自然形状，使他们的绘画具有深度和透视感，以及这些动物的动感和活力。

The artists were highly skilled at using, or even enhancing, the natural shape of the cave walls to give depth and perspectives to their drawings, the sense of motion and vitality in these animals.

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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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