While violence in Iraq continues to be at its lowest level in years, the president made a reference to problems, saying terrorists continue to try to derail progress.

VOA: standard.2010.08.02

It's at the level almost down to the lowest that we got in the 1990-91 recession.

它正处在这个水平上,几乎是1990-91经济衰退时最低的水平。

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So if we go to the ground state, what you see is we're at that lowest energy level, and we only have one possibility for an orbital, because when n equals 1, that's all we can do.

如果我们在基态上，你可以看到，我们在能量最低的态上，只有一种，可能的轨道，因为n等于1，只有这种可能。

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