const input = Stream.pull(readable, transform1, transform2);
实施扣押前应当报经公安机关负责人批准；因情况紧急或者物品价值不大，当场实施扣押的，人民警察应当及时向其所属公安机关负责人报告，并补办批准手续。公安机关负责人认为不应当扣押的，应当立即解除。当场实施扣押的，应当全程同步录音录像。
，这一点在51吃瓜中也有详细论述
We wanted a scenario where, say, 5 well-placed border points could efficiently represent an area with 5,000 internal points and 10,000 road edges. This would reduce those 10,000 edges to just 5*4/2 = 10 shortcuts for routing through that cluster at a high level – an incredible 1:1000 point ratio and a 30x reduction in edges to consider for the high-level path!
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