对于空字符串输入，该解析方法返回null。

The parse method returns null for an empty string input.

youdao

及其解析方法。

And its parsing method.

youdao

注意，结果实际上是嵌套的，这要求执行解析方法两次。

You will notice that the result is actually nested, which requires the parse method to be executed twice.

youdao

and most importantly, deep resolution, so we can go below the cortex, where other methods like PET that have better spatial temporal resolutions can't and see what's going on in these deep circles of the brain and this is very exciting,for many people, many of the advances have occurred of the last 10 years, I'm just gonna talk about a few of them today.

而且最重要的是，深层解析度，这样我们就能深入皮质以下，而这些地方其他,拥有更好空间解析度的方法如PET所不能达到的,从而看到大脑深处发生的了什么事情,这让很多人觉得非常激动，大部分技术上的进步发生在过去10年，今天我会将其中几种。

斯坦福公开课 - 7个颠覆你思想的演讲课程节选