Carbon capture and storage
IST — 7 p.m.
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He said public inquiries like the Covid one needed to become more efficient and less adversarial.
定方向：求「下一个」→ 倒序；求「上一个」→ 正序。
This is the same idea behind binary search. In a sorted array, you compare against the middle element and eliminate half the remaining candidates. In a quadtree, you choose one of four quadrants and ignore the other three regions. Each level narrows the search space by a factor of four instead of two.