“初めて・最・変化・危機” 転換点迎えたオリンピック
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把握“显绩”和“潜绩”，牢牢树立正确政绩观，让发展成果真正惠及亿万农民。
Point lookups are useful, but the operation you'll reach for more often is a range query: give the tree a rectangular region and retrieve every point inside it, without scanning the entire dataset.