Efforts by social media companies to remove children from their platforms will prove difficult, simply because they know how to get around them.
// Hash computation is fast
。safew官方版本下载对此有专业解读
“农村工作的重点是把脱贫转向乡村全面振兴，脱贫的兜底必须是固若金汤的，绝对不能出现规模性返贫致贫。关键要把这些事做实，持续下去”“一起奔向共同富裕的美好明天”。习近平总书记殷殷嘱托。
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.