VOA慢速英语:Polio Virus Used to Kill Brain Tumors

1. infect vt.使受影响，感染; 传染
例句：A single mosquito can infect a large number of people.
一只蚊子就可以感染很多人。

2. respond vt.回答，响应
例句：He did not respond to her advances.
他对她的友好表示无动于衷。

3. identify vt.确定; 识别，认出
例句：Never identify wealth with happiness.
千万不要把财富和幸福等同起来。

4. transform vt.变换; 改变
例句：It seems to me that a doctor can transform a whole community.
我觉得，一个医生可以改变整个社会。