From the RUNBOOM.COM,it said:

Scope(作用域) 是应用在 HTML (视图) 和 JavaScript (控制器)之间的纽带。

Scope 是一个对象，有可用的方法和属性。

Scope 可应用在视图和控制器上。

While,how many scopes can we have? is there any structure in it? I got those question when I come to it.

After a tough time reading,I think I have mixed up it with scope in java or python or whatever.

To be simple,it is a way to pass values from controllers to view(HTML),and nothing with structure.

I have to admit that here is a simple structure from rootscope to scope,while,here,we'd better ignore it as it has no contribution to our understanding of scope in Angularjs.