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「你會覺得自己是世界上最自由的人。你身邊是一群緊密的人，每個人都真心關心彼此——你們會變成一個小家庭。大家互相照應。」
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（三）未经批准设置无线电广播电台、通信基站等无线电台（站）的，或者非法使用、占用无线电频率，从事违法活动的。
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.