VOA慢速英语:What Happens When TB Becomes Untreatable?

no longer不再, 已不, 不复, 再也不
例句：He was long a famous musician, but he plays no longer.
他成为有名的音乐家已很久了, 但他现在不演奏了。
react to对…作出反应〔评价, 应答〕
例句：A dog reacts to kindness by wagging its tail.
狗摇尾巴以报答人们的爱护。

2. These are known as drug-resistant strains. Some resist even more drugs.

be known as被认为是
例句：Radio, television, newspapers and magazines are known as the mass media.
广播、电视、报纸和杂志被称为大众传媒。

3. The agency's director-general, Dr. Margaret Chan, is concerned about the spread of drug-resistant TB.

be concerned about关心,挂念
例句：She is concerned about your safety.
她不放心你的安全。

4. The WHO says new, stronger TB drugs could be available by the end of this year or early twenty-thirteen.

by the end of到…为止
例句：He had finished his great works by the end of 1980.
到1980年底, 他已完成了他的巨著。

5. Researchers are also working on vaccines to prevent the disease.

work on致力于…
例句：He has been working on a new novel for over a year now.
近一年多来, 他一直在写一部新小说。

6. She says the development process takes a long time, partly because people often do not get sick for years after getting infected with TB.

infect with把…传染给…
例句：The water was infected with germs.
这些水被细菌污染了。