Border Points: Each cluster has a limited number of defined "border points" – these are the gateways in and out of the cluster.
Now, OsmAnd performs another Dijkstra search, but this time on the much smaller "base graph." This graph consists only of the border points and the pre-calculated shortcut values between them.
，这一点在91视频中也有详细论述
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'Anxious' residents prepare for more flooding
The logic is fairly simple: I don’t give a shit what you name your player object. I don’t care how deeply you bury it in a closure. I don’t care what class you instantiate it from. At some point, you have to call .play(). And when you do, I’ll be waiting.