Not all air pollution starts out as soot.

并非所有的空气污染物一开始都是煤烟。

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"Nuclear winter," where we were all going to freeze to death after the soot from Reagan's nuclear war blotted out the sun, didn't quite happen. Rather, the Soviet Empire gave up the ghost.

“核冬天”，所谓里根的核战之后，核弹灰尘会遮天蔽日，我们将被冻死的情况，完全没有发生，相反，苏联帝国告别了那个(GC)幽灵。

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But not all air pollution starts out as soot.

但空气污染物最初的形态并不一定都是烟尘。

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