医生检查伤口是否有感染的迹象。

The doctor probed the wound for signs of infection.

《牛津词典》

严重感染的树木应该被砍掉并焚烧。

Badly infected trees should be felled and burned.

《柯林斯英汉双解大词典》

儿童受到感染的危险性要高得多。

The risk of infection is appreciably higher among children.

《牛津词典》

Hepatitis is a virus that specifically affects the liver, so viruses are often specific to certain kinds of cells.

肝炎病毒就可以特异性的感染肝细胞,因病毒通常都有细胞特异性

耶鲁公开课 - 生物医学工程探索课程节选

In contrast today, because we have antibiotics and we have vaccines, people don't die of infectious diseases as often.

相反,在现在,因为我们有了抗生素和疫苗,死于感染性疾病的人就不像以前那么多

耶鲁公开课 - 生物医学工程探索课程节选

Now if you smiled to-- or make three people smile, and these three people-- each one makes three other people smile.

如果你的笑-,感染了三个人，这三个人-,每个人又引起另外三人发笑。

哈佛公开课 - 幸福课课程节选