作为一名教育工作者和保健工作者，我和许多感染艾滋病病毒的儿童一起工作过。
In my dual profession as an educator and health care provider, I have worked with numerous children infected with the virus that causes AIDS.
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。
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.
如果一名妇女在怀孕期间发生某种感染，如风疹或水痘，那么婴儿在出生前就可能患上白内障。
If a woman has certain infections during pregnancy, such as rubella or chickenpox, the baby may develop a cataract before birth.
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