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（三）在铁路、城市轨道交通线路、桥梁、隧道、涵洞处挖掘坑穴、采石取沙的；，更多细节参见91视频
Video from the incident shows a large group of people following police officers, showering them with snowballs and jeering, as they retreat to their vehicles outside the park. Videos also showed officers shoving at least two people to the ground while getting hit from all directions by snowballs.。夫子是该领域的重要参考
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