It's taken from the inside of the furnace, and shows plasma - gas heated to about 1,000C - glowing brightly.
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，这一点在旺商聊官方下载中也有详细论述
2-phase A* already uses many heuristics which don't always create an optimal route and still 5-10x slower.，更多细节参见im钱包官方下载
Credit: Courtesy Instagram