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.      

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Scope in AngularJS