From the RUNBOOM.COM, it said:
Scope(作用域) 是應用在 HTML (視圖) 和 JavaScript (控制器)之間的紐帶。
Scope 是一個對象，有可用的方法和屬性。
Scope 可應用在視圖和控制器上。
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.