裂变的产物通常将散布在地球表面一片巨大的区域上，除非因为下雨产生局部核尘降。
The fission products are generally dispersed over a large area of the globe unless there is local rainfall resulting in localized fallout.
和空中爆炸相比，受局部核尘降影响的顺风区域要比冲击波和热辐射的影响区域大的多。
In contrast with air bursts, local fallout can be a hazard over a much larger downwind area than that which is affected by blast and thermal radiation.
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