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).
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However, this flexibility came at a cost for complex routes:
In the next step, words that are Cognate with Modern English are replaced. Note I am only replacing the cognates that are very obvious.。关于这个话题，heLLoword翻译官方下载提供了深入分析