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12月21日，嘉宾敲锣宣布先农坛庆成宫正式面向社会公众开放。本版摄影/新京报记者 浦峰
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The 3614/3624 series established a number of conventions that are still in use
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We have no way to skip over points that are obviously too far away. What if we could organize the space itself so that when we search, we can immediately rule out entire regions?