媒體英語(yǔ)會(huì)帶大家一起學(xué)習(xí) BBC 撰稿人在報(bào)道世界大事時(shí)常用到的單詞和短語(yǔ)。

一項(xiàng)重要科學(xué)研究報(bào)告指出，隨著 HIV艾滋病毒的不斷演化，此類病毒的“毒性”有減弱跡象。英國(guó)牛津大學(xué)的研究人員說(shuō)艾滋病毒本身出現(xiàn)的變化可能有助于對(duì)艾滋病疫情的控制。以下是 BBC 記者 James Gallagher 的報(bào)道：

More than 35 million people are infected with HIV. In their bodies, a devastating battle between the immune system and the virus is taking place, and it results in Aids once the body's defences are annihilated.

But a team at the University of Oxford found the immune system can score significant victories. Their study in Botswana showed HIV was being forced to make damaging mutations in order to survive.

It is now replicating more slowly and takes longer to cause Aids in the country. The group said the watering down of HIV would help efforts to eradicate the virus, but cautioned a weakened HIV was still dangerous.