大型公共活动人口密度大、流动性强，极易引发安全事故，造成大量人员伤亡和恶劣社会影响。
Large public activity has the character of big population density and strong fluidity, which is liable to safety accident and causes big casualties and social impacts.
大型公共活动人口密度大、流动性强，极易引发安全事故，造成大量人员伤亡和恶劣社会影响。
Large public activity has the character of big population density and strong fluidity, which is liable to safety accident and causes big casualties and social impacts.
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