全年近岸海域海水水质[90]达到国家一、二类海水水质标准的面积占84.9%，三类海水占4.6%，四类、劣四类海水占10.5%。
I found this article on the subject, and decided to turn that data into a visualization, too.，更多细节参见体育直播
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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.