哥本哈根大学医院的研究人员称，这“难以解释”为众所周之的低密度脂蛋白或胆固醇可导致阻塞动脉的动脉粥样硬化。

The researchers at Copenhagen University Hospital said this was "difficult to explain" as LDL, or bad, cholesterol is known to cause atherosclerosis which can block arteries.

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因此除了使用人群密度特征之外，本文还提出了人群阻塞率的概念来辅助侦测突发人群聚集事件。

Therefore, this paper defines a feature called Blocking Rate of Crowd, which is used to detect the unexpected crowd incidents.

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随后对含有突发人群聚集现象的场景和正常高密度人群场景的人群阻塞率进行了对比，由此证实了该参数的有效性。

And then it gives the blocking rate of crowd in both normal scenes and abnormal scenes, which confirms the validity of this argument.

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