We even tried building hierarchies with 2-3 levels, but the number of shortcuts grew too fast for higher levels if we generated a full graph inside each cluster.
在集上买东西，买不了吃亏，买不了上当，但明显贵的东西，一准儿得长心。
。关于这个话题，WPS官方版本下载提供了深入分析
Овечкин продлил безголевую серию в составе Вашингтона09:40
Estimated shortcuts: ~91 million (a manageable number for global routing)