Because it is usually received in real time, the disconnected party can also receive it.

Learning refers to the process of acquiring knowledge and skills through reading, listening, thinking, research and practice. Learning can be divided into narrow sense and broad sense: narrow sense: the process of acquiring knowledge or skills through reading, attending lectures, researching, observing, understanding, exploring, experimenting and practicing is a behavior mode that enables individuals to obtain continuous changes (the improvement and sublimation of knowledge and skills, methods and processes, emotions and values). Such as the process of acquiring knowledge through school education.