（二）在铁路、城市轨道交通线路上放置障碍物，或者故意向列车投掷物品的；
If executed well, Delaunay-based tetrahedral dithering can outperform the N-convex method and produce results that rival Knoll’s algorithm. The devil is in the detail however, as actually implementing a robust Delaunay triangulator is a non-trivial task, especially where numerical stability is concerned. The additional memory overhead required by the triangulation structure may also be a concern.
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The Formula 1 channel on Apple TVBilly Steele for Engadget，详情可参考服务器推荐