Of course. Online class playback refers to the knowledge points you don't understand after the live class, and you can also review them in the live software. Online classroom playback can be shown to foreign students. Online courses are online courses that are learned by electronic devices through the Internet. It is a web-based course, that is, a course learned through a browser on the Internet. Network course is a course that embodies modern educational ideas and modern pedagogy theories. Online courses are based on resource learning, situational learning and collaborative learning. Network course refers to the course characterized by interactivity, sharing, openness, cooperation and autonomy in the learning process.