They found that over a period of six years, planting three rows of trees reduced total dust and ammonia by more than half.

VOA: special.2009.09.08

So, this means we have a total of six electrons that we need to put into molecular orbitals.

这意味着我们一共有,6个电子要放进分子轨道。

麻省理工公开课 - 化学原理课程节选

So, we end up with a total of six electrons that are possible that have that 2 p orbital value.

所以我们最后,总共得到了6个电子,在所有可能的“2p“轨道值中。

麻省理工公开课 - 化学原理课程节选

This made a total of twenty-six medals for American athletes.

VOA: special.2010.02.26