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Palaeolithic hand axe
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Analysis: Labour’s worst fears realised
当小天才手表像书包、铅笔一样，成为校园的“标配”，我们或许应该思考：这块本为“安全”而生的小屏幕，为何悄然变成了孩子们的“社交竞技场”？
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.