So if we take a look at nitrogen here, what you'll notice is we have thre available for bonding, - and we already have our lone pair -- one of our orbitals is already filled up.

如果我们看一下氮原子，我们注意到我们可以成3个键，我们已经有一个孤对-,其中的一个轨道已经被填满了。

麻省理工公开课 - 化学原理课程节选

That is not true for Crete because, although they had a script-- and we have available to us tablets with those writings on them-- to this day no one has deciphered the language written by the Minoans.

不过对于克里特来说不行,因为,虽然他们的确有一些手稿存世...,我们能够看到这些写着字的残片,不过直到今天,没有一个人能破译米诺斯文明的文字

耶鲁公开课 - 古希腊历史简介课程节选

So if we still have an angle of a 109 . 5 degrees, and again, we still have four unpaired electrons available for bonding, we can make one of those bonds with another s p 3 hybridized carbon, so we're going to make up one pair here.

如果键角仍然是109。,同样，我们还有4个未配对的电子可以用来成键，我们可以用其中的一个,和另外一个sp3杂化碳原子成键，这样我们可以组成一对。

麻省理工公开课 - 化学原理课程节选