But researchers reported recently that the evidence was stronger when they combined the results of the four major studies already done.

VOA: special.2009.09.22

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

The mens four-member Nordic team finished second in the Nordic combined race for a silver medal.

VOA: special.2010.02.26

Junior Achievement Incorporated and Junior Achievement International combined their operations in two thousand four.

VOA: special.2009.11.27

U.N.agencies say pneumonia is responsible for one in four child deaths, more than HIV/AIDS, malaria and measles combined.

VOA: standard.2009.11.02

Bill Demong became the first-ever American to win a gold medal in Nordic Combined and the Steve Holcomb drove his four-man bobsled team to the first U.S.Olympic gold medal in the event in 62 years.

VOA: standard.2010.03.01