Without new treatments,the W.H.O.says, the number of new cancer patients could reach twenty-seven million a year by two thousand thirty.

VOA: special.2009.03.02

So, the first thing we do is put two electrons between h and c, and then two electrons between c and n.

那么，我们先在氢和碳之间放两个电子，然后在碳和氮之间再放两个电子。

麻省理工公开课 - 化学原理课程节选

So, we see that the two h atoms separate have a certain energy that's lower than when the electron's not with the atom.

那么，我们看到两个分开的氢原子所具有的能量,比原子中没有电子时更低。

麻省理工公开课 - 化学原理课程节选

The W.H.O.offices for the Americas and the Western Pacific reported two out of three of those cases.

VOA: special.2009.11.24

Adiabatic q equal to zero. It's also delta H 0 which is zero. The two didn't necessarily follow because remember, delta H is dq so p is only true for a reversible constant pressure process.

在这个过程中ΔH等于,绝热的所以q等于0，而ΔH也等于,这两个也不一定有因果关系,因为，记住，ΔH等于dq只有在恒压。

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

So, if we talk about dissociating h 2, we're going from the h 2 molecule, and breaking this bond right in half, so we now have two individual hydrogen atoms here.

那么，如果我们讨论的是离解氢分子，我们将从氢分子开始，使这个键断裂，一分为二，那么就得到了两个分开的氢原子。

麻省理工公开课 - 化学原理课程节选

Two studies showed ways in which anti-H.I.V.drugs could permit infected women to breastfeed their newborns with less risk of passing the virus to them.

VOA: special.2009.07.29

So, let's change our graph where we now have this zero point set as the two individuals hydrogen atoms, and then we see that our h 2 molecule is at the negative of the dissociation energy, or the negative what that bond strength is.

那么让我们把曲线图中的零点能改到,两个分离的氢原子处，那我们就会看到,氢分子就是负的离解能，或者负的键的强度。

麻省理工公开课 - 化学原理课程节选

The W.H.O.says two hundred forty-seven million people became infected with malaria in two thousand six.

VOA: special.2009.05.26

H2 So the simplest case we can think of is with h 2 where we have two unpaired electrons, each in a 1 s orbital of a separate h atom.

最容易想到的例子是2,我们有两个未配对电子，每个都在一个分开的1s轨道上。

麻省理工公开课 - 化学原理课程节选

It says H.I.V.-related deaths appear to have reached their highest point in two thousand four.

VOA: special.2009.12.02

And if we picture those two coming together, we form the h 2 molecule.

如果我们想象它们两个靠近时，我们会形成H2分子。

麻省理工公开课 - 化学原理课程节选

It says H.I.V.-related deaths appear to have reached their highest level in two thousand four.

VOA: special.2009.12.08

from mother to child. She noted a United Nations report that in two thousand eight about four hundred thirty thousand babies were born with H.I.V.

VOA: special.2010.05.24

Still,the W.H.O.says there are two major barriers.

VOA: special.2010.04.13

About two-thirds of the people with H.I.V.

VOA: special.2009.12.02

The W.H.O.says since 1988, more than two billion children around the world have been immunized against polio.

VOA: standard.2010.08.02