It's taken from the inside of the furnace, and shows plasma - gas heated to about 1,000C - glowing brightly.
增值电信业务经营许可证：沪B2-2017116
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2026-02-28 00:00:00:03014271610http://paper.people.com.cn/rmrb/pc/content/202602/28/content_30142716.htmlhttp://paper.people.com.cn/rmrb/pad/content/202602/28/content_30142716.html11921 彭清华会见老挝和平与团结委员会考察团
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.
Crucially, this distribution of border points is agnostic of routing speed profiles. It’s based only on whether a road is passable or not. This means the same set of clusters and border points can be used for all car routing profiles (default, shortest, fuel-efficient) and all bicycle profiles (default, prefer flat terrain, etc.). Only the travel time/cost values of the shortcuts between these points change based on the profile. This is a massive factor in keeping storage down – map data only increased by about 0.5% per profile to store this HH-Routing structure!