Shortcut Pre-calculation: For the most commonly used speed profiles, the travel costs (time/distance) for shortcuts between border points within each cluster are pre-calculated and stored. (Each border point effectively has an "entry" and "exit" aspect for directed travel).
中国载人航天办公室官方宣布，2026年，计划实施2次载人飞行任务、1次货运飞船补给任务。今年的载人航天有两大亮点，一是来自港澳地区的航天员，有望最早于今年执行空间站飞行任务。
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We even tried building hierarchies with 2-3 levels, but the number of shortcuts grew too fast for higher levels if we generated a full graph inside each cluster.