require some technical skills and some features may require a paid
记者：5年过渡期，我们牢牢守住了不发生规模性返贫致贫的底线，请问这得益于哪些有力措施？
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To find these crucial border points, we employed a clever technique based on the Ford-Fulkerson algorithm. By simulating "flooding" roads with traffic from random start/end points, we could identify the natural bottlenecks – the "minimum cut" in graph theory terms. These bottlenecks became our border points.
（三）在铁路、城市轨道交通线路、桥梁、隧道、涵洞处挖掘坑穴、采石取沙的；