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。
Sharing needles among injecting users is one of the primary means of spreading the HIV virus in Russia, where a hidden epidemic has seen transmission rates spiral.
在俄罗斯，与他人共同使用同一注射用针头是传播HIV病毒的主要途径，疫病暗中流行，传染率不断上升。
The epidemic is spreading to less well-off places: Mexico has the second-largest share of obese people after America; Guatemala's obesity rate has quadrupled in 30 years.
疫情蔓延至较不富裕的地方：墨西哥肥胖人数在美国之后居世界第二；危地马拉的肥胖率在30年中翻了两番。
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