2-phase A* already uses many heuristics which don't always create an optimal route and still 5-10x slower.
俯身下瞧，正在解冻的泥土有些湿润，颜色深了一层，显出大地有了不易察觉的脉动。树根周边，几针鹅黄的纤弱到让人心疼的草尖，正顶开碎土，探出一点小芽。那嫩黄，是生命最初的颜色，亮亮的、怯怯的，纯粹得不染一丝尘埃。它们被微风一逗，便颤巍巍的，像是要笑，又像是害羞，最后终于奋不顾身地破土上冲。
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