The goal of treatment is to lower HIV levels to help the immune system renew itself and keep people healthier longer, in part to stem the spread of the virus.

治疗目标是降低艾滋病毒水平，以帮助免疫系统的自我更新，并保持人民较长的健康，部分原因也是为了阻止病毒扩散。

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"Most businesses appear to have Conficker under control," he said. "They've applied patches and updated their anti-virus software to stem the spread of the worm."

大多数公司看来Conficker已得以控制“他说道，”他们给软件打好了补丁，升级了防病毒软件以遏制蠕虫的传播。

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Professor Van Tam said the findings confirmed the need to regularly wash your hands and sneeze into your elbow when on public transport to stem the spread of winter viruses.

凡教授说这些发现更加说明了人们应该习惯性地洗手并在公交车上尽量朝着肘部打喷嚏以阻止冬季病毒的传播。

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The government has even explored the possibility of closing schools to stem the spread of the virus.

VOA: standard.2009.07.31

We have a big job on our hands,". Borlaug expressed concern about a new variety of wheat stem rust attacking wheat plants in Africa and advocated greater coordination of researchers around the world to stop its spread.

VOA: standard.2009.09.13

Foreign doctors and nurses are trying, for instance, to stem the spread of infectious diseases.

ECONOMIST: Western man��s burden

The formation of such paramilitary groups was stepped up across Indonesia late last year, ostensibly to stem the rapid spread of violence and rioting.

ECONOMIST: East Timor

In 1997, before he was charged, authorities in the western New York city of Jamestown took the unusual step of announcing publicly that Williams was HIV positive in an effort to stem further spread of the virus by Williams' partners to others.

WSJ: Lawyer: NY man at center of HIV scare not positive