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The tree starts as a single region covering the whole space. As points arrive, they get dropped into the region that contains them. When a region exceeds its capacity (the maximum number of points it can hold before splitting), the region divides into four children, and the existing points get redistributed.
，更多细节参见搜狗输入法2026
await blocking.writer.write(chunk3); // waits until consumer reads
（二）具有批量控制移动电话卡的功能的；