South Africa has more than five million people infected with H.I.V., the largest number of any country.

VOA: special.2009.07.29

And the bigger lesson from that is that entropy, unlike energy u or enthalpy H, we could define an absolutely number for it.

热力学第三定律的一个更重要的推论是,与内能和自由焓不同，我们可以给上定义一个绝对的数值。

麻省理工公开课 - 热力学与动力学课程节选

At current growth rates, the W.H.O.expects the number to reach twenty million by two thousand fifteen.

VOA: special.2009.07.15

The W.H.O.says insecticide-treated bed nets have been shown to reduce the number of malaria cases by fifty percent and the infection rate by ninety percent.

VOA: special.2010.04.20

In Eastern Europe, the number of new H.I.V.infections has leveled off.

VOA: special.2009.12.08

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

VOA: special.2009.12.08