Range queries ask "what's inside this box?" But sometimes the question is "what's nearest to this location?" This is the nearest neighbor problem, and you don't know how big your search radius should be. The nearest point might be right next to you or far away.
这段完整视频拍摄时长接近11分钟，提供了一个罕见的、不受限制的视角，清楚展现了袭击者的射击位置，以及袭击结束前现场的情况。其中，袭击过程有5分52秒。
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（四）组织开展主题性群众性科普活动。高校应立足学科特色与科技资源优势，在全国科普月、全国科技工作者日、全国科技活动周等重大活动期间，面向公众组织开展主题性科普活动。有条件的高校应向公众开放科技基础设施和科技资源，举办高校科学节、实验室开放日、前沿科技体验周等科普活动，以生动的科技创新科普化成果，培育和弘扬创新文化，推动形成崇尚科学、追求创新的风尚。
First, the pipes will be fed by new wide inlet heads, which slow the water so that fish are not sucked in. And to prevent fish swimming within two metres (6.5ft) of the intakes, the new acoustic system is being tested.