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.
1936年10月，历经艰苦卓绝的二万五千里长征，红军三大主力胜利会师，淬火新生的中国共产党由此开启了中国革命波澜壮阔的新画卷。
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如今我们以黎明信使的身份归来——
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