如果把时间线拉长来看，触屏电脑的意义或许并不在当下，而在未来。
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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Line官方版本下载