So, if something cycles through five wavelengths in a single second, we would just say that the frequency of that wave is five per second.

如果一个东西在一秒,内经历了五个波长，我们就说这个波的,频率是每秒5次。

麻省理工公开课 - 化学原理课程节选

According to the Second Brother, it's virtually impossible for a single, helpless maiden to pass uninjured in this wild, surrounding waste.

弟弟认为，一个孤独无助的女孩想要，毫发无伤的穿过这野外的荒原是根本不可能的。

耶鲁公开课 - 弥尔顿课程节选

We also need to follow Hund's rule, this is that a single electron enters each state before it enters a second state.

我们也需要遵从洪德规则，这是一个电子在进入第二个态之前,要进入每一个态。

麻省理工公开课 - 化学原理课程节选

And by state we just mean orbital, so if we're looking at the p orbitals here, x that means that a single electron goes in x, and then it will go in the z orbital before a second one goes in the x orbital.

我们说的态仅仅意味着轨道，所以如果我们观察这里的p轨道，那意味着单个电子进入，然后它会进入z轨道,在它第二个进入x之前。

麻省理工公开课 - 化学原理课程节选