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據此，宋高祖向BBC分析，對北京而言，與歐洲接觸是一種務實選擇，用來抵銷來自美國的壓力，並將自身塑造為更穩定的全球力量。這有助於北京將自己定位為國際秩序的捍衛者，「強調與德國的直接雙邊關係，可能比透過歐盟的集體機制為中國創造更多操作空間。」。业内人士推荐WPS官方版本下载作为进阶阅读
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.