热辐射密度以核爆点距离平方倒数的速度衰减，爆炸、冲击波、致电离辐射效应的衰减速度则更快。

The intensity of thermal radiation decreases only as the inverse square of the distance from a nuclear detonation, while blast, shock, and prompt ionizing radiation effects decrease more rapidly.

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随着汽车的保有量迅速增加，车流密度也在不断提高，汽车在运行时经常处于加速超车、减速制动等变速运行工况。

With the increase in the Numbers of vehicles, the density of traffic flow is also increased which results that vehicles move with non-uniform velocity on road such as accelerating and braking.

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