She says that raising animals for food is responsible for the release of more greenhouse gases than all forms of transportation combined.

VOA: special.2009.11.06

What we do care about is the energy of our orbitals that have electrons in them, and if we combined all four of the orbitals, then our hybrid orbitals would have more p character to them, so they'd actually be higher in energy.

是不是很高,我们不关心它的能量很高，我们关心的是，有电子的轨道的能量，如果我们把四个轨道结合。

麻省理工公开课 - 化学原理课程节选

It says suicide deaths account for more than half of all violent deaths in the world more than all deaths from wars and homicides combined.

VOA: standard.2009.09.10

"And,all of it combined will give us an overall population health."

VOA: standard.2010.02.22