Instead, they are defined as abstract controls in which the actual markup rendered by the control can be quite different from the model that you program against.

而是定义为抽象控件，在抽象控件中，控件所呈现的实际标记与编程所使用的模型可能截然不同。

youdao

Concluding, how do these numbers translate into actual telco profit markup on text service, to evaluate market efficiency?

FORBES: Insane Calculation: It Costs More To Send A Text Next Door Than To Mars