infect /inˈfekt/ vt. 1. 传染，染上：The flu virus infected almost the entire class. 流感病毒几乎把整个班级都传染上了。The wound was infected with germs. 伤口染上细菌了。 2.影响，感染：One bad boy may infect a whole class. 一个捣蛋的孩子有可能影响整个班级。The captain’s courage infected his men. 上尉的勇气感染了他的战士。
infection /inˈfekʃən/ n. 传染［u］；传染病［c］：infection from inpure water(by flies)脏水（苍蝇）引起的传染；suffer from a lung inflection患肺传染病
infectious /inˈfekʃəs/ adj. 1.传染的，传染性的：an infectious disease 传染病；an infectious hospital传染病院 Colds are infectious. 感冒传染。［考句］The heavily populated area was a breeding place for infectious diseases.人口拥挤的地方是传染病的温床。2.有感染力的，易传播的：infectious laughter 使大家都会发笑的笑声
