So seriously, you fortunate Yalies, that they will be here on April 9 and 10 of 2008, an international conference on the subject of the hoplite phalanx and the emergence of the city state.

你们这些幸运的耶鲁学生们,2008年4月9日到10日将会看到,关于重步兵方阵和城邦起源话题的,国际会议

耶鲁公开课 - 古希腊历史简介课程节选

When we talk about the n equals 2 state, we now have 2 squared or 4 degenerate same energy orbitals, and those are the 2 s orbital.

当考虑n等于2的态时，我们有2的平方,或者4个简并能量的轨道，它们是2s轨道。

麻省理工公开课 - 化学原理课程节选

So the key word here is that we asked you to identify the third excited state. So, what white is n equal 4 Ok to for the third excited state? 4 OK.

这里的关键的地方是我,要你们找到第三激发态,第三激发态的n等于多少？

麻省理工公开课 - 化学原理课程节选

So, the third excited state, is n equal to 4, because n equals 2 is first excited, 3 is second excited, 4 is third excited state.

因为n等于2是第一激发态,等于3是第二激发态。

麻省理工公开课 - 化学原理课程节选