"Now these initiatives comprise a first wave of programs to promote global entrepreneurship.
VOA: special.2010.05.10
These are things that must be taken in from the environment because your body cannot manufacture them and they promote specific chemical reactions in the body.
这些都是必须从外界摄取的物质,因为无法通过自身合成,它们能促进体内特定的化学反应
So if we take our carbon atom here, which has two electrons in the 2 s orbital, and we promote one of these electrons into a 2 p orbital, what we see now is that yes, we do, we have four unpaired electrons.
这是碳原子,2s轨道里有两个电子,我们把一个电子激发到2p轨道里,我们看到现在,是的,我们有4个未配对电子。
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