爱奇艺去年营收 272.9 亿元，连续四年盈利
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貝恩表示，大約有40,000家英國企業向美國出口，而這5%的額外關稅最終會由出口商或其美國客戶承擔。
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.