Researchers say they have found a way to extend the storage life of a drug used to treat H.I.V.

VOA: special.2010.05.24

If you want to write it as a vector equation, you want to write it as v square over r minus-- I want to say that it's pointing in the direction toward the center.

如果要写出矢量方程,就应该写成 -v^2 / r,也就是说,方向就向圆心

耶鲁公开课 - 基础物理课程节选

Aristotle certainly recognized that the accumulation of political knowledge you might say the gathering of data the organization of facts is very important. Books III IV V of the Politics shows the empirical side of Aristotle's politics.

亚里士多德确实,体认到积聚政治知识,你也能说是收集数据,整理实证是非常重要的事,政治学》第，III，IV，V，册显示出,亚里士多德政治的,经验依据层面。

耶鲁公开课 - 政治哲学导论课程节选

AIDS researchers say they still have much work to do on a vaccine against H.I.V.

VOA: special.2009.09.30

C.D.C.officials say U-V rays can damage your skin in as little as fifteen minutes.

VOA: special.2010.07.06

Now,researchers say they have evidence that chimpanzees with S.I.V.

VOA: special.2009.09.08

Experts say the number of new H.I.V.

VOA: special.2009.12.08

Experts say new H.I.V.

VOA: special.2009.12.02

John Silvia is the senior economist at Wells Fargo Bank: "Private payroll gains continue to be modest and I would say it does raise flags for those super optimists who were looking for a V-shaped recovery and thinking that we are going to go back to normal very quickly in the US.economy."

VOA: standard.2010.07.02