病房的窗帘拉开得早，天光微明，护士已来送药，叮嘱一天的注意事项。妻子风雨无阻地来送饭了，她问：“你湖北有朋友吧，瞧，给你寄水果来了。”有点吃惊，我患病住院的消息连北京的朋友都很少知道，千里之外是谁在惦念着我呢？
思想的伟力，跨越山海，指引前行道路。
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Shortcuts: For common scenarios, we pre-calculate the travel time/distance (the "shortcut") between border points within the same cluster and also to border points of immediately adjacent clusters.
self.file = open(csv_path, "a", newline="", encoding="utf-8")