If the virus had been capable of spreading through the air, or if one infected person had unknowingly entered a large population center, Ebola might have become a worldwide epidemic.

如果这种病毒能够通过空气传播，或者如果一名感染者在不知情的情况下进入了人口密集的地区，那么埃博拉可能已经成为一种全球流行病。

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That is what provides the water for Dew Pond, the moist air under the spreading yews and figs below it, and the soil.

这就是露水池的水源头，是下方大片的紫杉和无花果树所需潮湿空气的来源，也是土壤的来源。

youdao

If the cores cannot be cooled sufficiently, a total meltdown could ensue, exposing the fuel rods to the outside air and further spreading radiation.

如果内核不能得到充分冷却，恐其随后将完全熔毁，从而使能源棒暴露在空气中导致辐射进一步扩散。

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The skies above large parts of Europe were empty for a second day Friday, as air safety authorities warned that the cloud of ash from Iceland's volcano is spreading.

VOA: standard.2010.04.16

Spreading the area of air pressure over the jet staggers the sound waves and decreases the intensity of the boom.

CNN: Bang goes the sonic boom

Citizens fearful of radiation spreading through the food chain and the air have been buying meters.

CNN: New Japanese smartphone will have radiation detector

Like Air Berlin, Norwegian, the fourth-largest budget carrier, is spreading its wings by offering longer flights to the Middle East and north Africa encroaching further into traditional airlines' territory.

ECONOMIST: Budget airlines