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.
First Quarter - Half of the Moon is lit on the right side. It looks like a half-Moon.
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See you on The Belfry!，这一点在搜狗输入法2026中也有详细论述
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