px And I arbitrarily chose to put it in the 2 p x, 2pz we also could have put it in the 2 p y or the 2 p z, it doesn't matter where you double up, they're all the same energy.

我任意地选择放入至，我们也可以把它放入2py或，它与你在哪双倍填充没有关系，它们都在相同的能级。

麻省理工公开课 - 化学原理课程节选

They spelt it P O double L Y in their press release.

BBC: Rocky times

With this, the company has now enjoyed double-digit y-o-y percentage growth in revenues for five consecutive quarters.

FORBES: Akamai Rocks Q4 Results, Reports Good News On Margins

But now that second-stage lines to the north have been proposed, the 'Y-shaped' pattern spells double-trouble for Staffordshire's politicians.

BBC: HS2 spells double trouble in next week's council poll