但在平流层，它们可以在高处停留数年，高速的风对其进行传播，这意味着全球都受到了威胁。

But in the stratosphere they can stay aloft for years, spread by fast winds known as jets, meaning the threat is global.

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家里的地下停车场或者办公大楼的地下室要比停留在建筑物第一层能给你提供更多的保护。

An underground area such as a home or office building basement offers more protection than the first floor of a building.

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平流层的空气一般停留在对流层上空，向两极移动，然后再下沉到高纬度带的低层大气。

Stratospheric air generally rises above tropical latitudes, spreads toward the poles, and then sinks back toward the lower atmosphere at high latitudes.

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