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Cuban President Miguel Díaz-Canel on Thursday vowed to defend the Caribbean country against aggression.
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The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.
item = parse_detail(u, d)
相信我，养成这个习惯，你的成片率会大大提高。