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theguardian.com
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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.
邮轮在欧美是“生活方式”，是“目的地本身”。老外度假就是找个地方晒太阳、看日落、喝喝酒，船开到哪无所谓，重要的是在船上发呆。