A report Tuesday by state safety regulators said the mine was crammed with too many work crews at one time, preventing a rapid evacuation.
国家安监部门周二的一份报告称，煤矿一次下井人员过多，导致不能迅速疏散。
The required safety egress time of people is generally determined by setting up evacuation model.
人员必需安全疏散时间一般是通过建立人员疏散模型来确定。
It provides suitable environment for safety evacuation, stop and rest, stop over and party. At the same time, it carries on place for some business activities.
它给疏散、休憩、停留、聚会及进行某些商业活动提供了适宜的环境和场所，它是商业建筑不可或缺而且尤为重要的组成部分。
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