She researched some of the places Darwin visited on his trip on the ship H.M.S.Beagle in the eighteen thirties.

VOA : special.2009.02.27

And if you work out the energetics as we've gone with thermochemistry, dH you discover there's a huge negative delta H.

如果你计算能量变化,就像在化学热力学中所作的一样，你会发现很大的负的。

热力学与动力学课程节选 : 麻省理工公开课

we know that h is always terminal, right after the molecule that it's attached to.

我们知道氢原子永远都在末端，放到和它成键的分子的后面。

化学原理课程节选 : 麻省理工公开课

The idea is that mothers would pour the liquid into the baby's mouth as part of an H.I.V.treatment program.

VOA : special.2010.05.24

In the past,the W.H.O.and experts with America's Centers for Disease Control and Prevention noted guidance for disease spread on airplanes.

VOA : special.2009.07.14