Originally, we thought it's information needs only; we just need to find a web page that contains the query word, but it's actually not.

起初，我们以为人们只是需要信息而已;,只需找到一个带有关键字的网页即可，但实际上并不是。

斯坦福公开课 - 百度CEO李彦宏演讲：全球最大搜索引擎的发展课程节选

So if we compare l increasing here, so a 3 s to a 3 p to a 3 d, what we find is that it's only in the s orbital that we have a significant probability of actually getting very close to the nucleus.

我们比较当ｌ变大的时候，从３ｓ到３ｐ到３ｄ,我们可以发现只有ｓ轨道,有很大的概率,非常接近原子核。

麻省理工公开课 - 化学原理课程节选