优势：前期大步长让元素快速移动到大致位置，后期小步长精细调整
Full Moon - The whole face of the Moon is illuminated and fully visible.
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And for those who say Old English is more like German... look how far we got without using it at all! Though at this point, it would be helpful:
This combination – localized Dijkstra, super-fast abstract graph traversal, and highly localized A* refinement – is what delivers the 100x speedup.