Shortcuts: For common scenarios, we pre-calculate the travel time/distance (the "shortcut") between border points within the same cluster and also to border points of immediately adjacent clusters.
（二）未取得驾驶证驾驶或者偷开他人航空器、机动船舶的。
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过去的软件行业，其实有一种很典型的“匠人红利”。谁代码写得更优雅，谁框架更熟，谁对某个领域理解更深，谁就更有价值。 技术壁垒主要建立在熟练度和经验积累之上。