The United States held S&P's top rating for seventy years and never had a downgrade.

VOA: special.2011.08.12

s And if we go ahead and superimpose the 3 s on top of the 3 p, you can see that the 3 s actually has some bit of probability density that gets even closer to the nucleus than the 3 p did.

如果我们继续将,重叠到3p上面，你们会看到3s事实上,有一点概率密度,距离原子核更近,比3p轨道。

麻省理工公开课 - 化学原理课程节选

You can see if we combine the s with the top lobe of the p, they're going to constructively interfere because they have the same sign.

你们会看到如果我们把s轨道和p轨道的上叶结合，它们是相长干涉,因为它们负号是相同的。

麻省理工公开课 - 化学原理课程节选

And though three senior vice presidents, all of them Western, were axed as part of an earlier restructuring in January, top American execs like Gerry P.

FORBES: Cover Curse

Also, Dell, like H-P, is faced with trouble at the top, which adds some uncertainty to its future.

FORBES: Solid Quarterly Results Expected For Dell, But Struggles Ahead Remain

He has served as a top deputy to Charleston Mayor Joseph P.

WHITEHOUSE: Our Top Stories