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。
"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。
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。
We must stem the spread of foreclosures and do everything we can to help responsible homeowners stay in their homes.
我们必须阻止取消延期偿付命令的蔓延，做我们一切可以做的事情来帮助相关的房主们可以呆在他们自己的家里。
Several recent studies have identified tiny populations of tumor cells that appear to act like stem cells, driving the tumor's ability to grow and spread.
近期一些研究鉴定出很少的肿瘤细胞种群，它们的行为显得像干细胞，推进肿瘤生长和扩展能力。
Several recent studies have identified tiny populations of tumor cells that appear to act like stem cells, driving the tumor's ability to grow and spread.
近期一些研究鉴定出很少的肿瘤细胞种群，它们的行为显得像干细胞，推进肿瘤生长和扩展能力。
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