今年的三星可不是小涨价，而是结结实实大涨了一波。
A quadtree does the same thing for two-dimensional space. It takes a rectangular region and divides it into four equal quadrants: northwest, northeast, southwest, southeast. If a quadrant has too many points in it, it subdivides again and again. Each subdivision creates smaller and smaller cells where points are densely packed.
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“There’s a pool, I think, of wannabe buyers who have just been sitting on the sidelines and waiting for rates to come down,” Daniel Seely told WSJ. “If they see a drop from above 6, to having that first number be 5, I think that would bring a lot of people out.”