超过50英里的半径后，危险性一般不需要疏散人口。
Beyond this 50-mile radius, the risks do not currently call for an evacuation.
着重讨论了疏散人口和疏散地点间的关系，简单介绍了模糊疏散距离及其初步确定方法。
The relation between the evacuating population and places is discussed with emphasis, and the fuzzy evacuation distance is introduced and determined simply.
在这个模型中，我们应该找到最近的紧急出口，以模拟人口疏散。
In this model, we should find the hithermost emergency exit to simulate the population evacuation.
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