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).
Both of the surgeons the BBC talked to also agree that it is important for patients to speak to their healthcare professional about the benefits or risks of the drugs.
，更多细节参见同城约会
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