今年1月，哈法亚公司走进当地社区，向45所伊拉克中小学捐赠了笔记本电脑及配套的网络设备。这批捐赠物资将直接惠及近1.6万名伊拉克学生，为他们打开通往数字世界的窗口。“此次捐赠活动反映了中国企业与社区之间富有成果的合作。”伊拉克米桑省教育局局长贾瓦德·卡迪姆表示，感谢中方对当地教育事业的支持。在捐赠现场，孩子们看到崭新的数字设备，兴奋欢呼起来。
The spatial view (the grid of rectangles) and the tree view (the hierarchy of nodes) represent the same structure. Searching for a point means walking down the tree: at each node, you check which of the four children contains your target coordinate and recurse into that child. You never visit the other three.
，这一点在同城约会中也有详细论述
NASA leaders said the shakeup is meant to address a larger underlying problem: the U.S. agency is flying its most powerful rocket too infrequently and repeating some of the same technical issues from one mission to the next.
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