（二）违反国家规定，在文物保护单位附近进行爆破、钻探、挖掘等活动，危及文物安全的。
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.
，详情可参考51吃瓜
But the church has worked with the Bats in Churches team to find a solution - they've built a sealed-off loft conversion above the vestry.
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