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).
What if you create a truly unique routing profile that's wildly different from the common ones for which shortcuts were pre-calculated? The system is smart. If it detects that too many shortcuts (~50, for example) need on-the-fly recalculation and deviate significantly, it might determine that falling back to the original, comprehensive A* algorithm for the entire route would actually be faster than doing many small, heavily modified A* calculations.，更多细节参见safew官方下载
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工傷後，雇主不跟他續約，但他才剛還清債務，正要開始存錢，沒有離開台灣的理由。他因工傷紀錄使求職困難，輾轉15家仲介公司才重新找到工作。如今，他在一家拖鞋工廠任職，採按件計酬，每天工時長達15小時，月休僅有兩天。
（一）发生增值税法第三条至第五条以外的经营活动，并取得与之相关的货币或者非货币形式的经济利益；