Breast milk can help protect babies against infection. 母乳有助于保护婴儿不受感染。
There are many things you can do to reduce your risk of infection. 你可以采取很多措施来降低被感染的危险。
Most throat infections are caused by viruses. 大多数喉部感染都是由病毒引起的。
The infection spread to his lungs. 感染已扩散到他的肺部。