And what the second point of Aufbau says is that as electrons begin to fill those levels the differences in energy may shift so that in an unoccupied state certain levels may be in the inverse order from how they are in the occupied state.

构造原理谈到的第二点是,当电子开始布满这些层时,能量差可能会有改变,所以在一个未占据的确定能级,可能与它们占据时,的排布顺序是相反的。

麻省理工公开课 - 固态化学导论课程节选

The second shift within the health-care industry has been to change patients' incentives with more cost-sharing and larger deductibles.

ECONOMIST: America's health-care crisis: Desperate measures | The

The second shift in the investment-banking landscape is a hollowing-out of the midsized banks as the very biggest in the industry grab a greater share of trading revenues.

ECONOMIST: Investment banking

The second shift, Wally said, is that once his son decided he wanted to be a great golfer, everything else, including the basic structure of the family, took a back seat.

WSJ: Peter Uihlein's Masters Debut Raises Questions About Golf's Talent Pipeline