Figure 2.

Architecture of the proposed teaching system, which comprises three parts: the application program, ARCore cloud anchors, and AR environment. The application program contains multiple teaching topics, each of which is implemented by the AR-based teaching content in the system. The ARCore cloud anchor module contains the same number of topic managers as topics. Each topic manager has multiple scene managers and anchor managers to store virtual contents and the corresponding anchor positions, respectively. The AR environment is composed of multiple topic spaces, each of which comprises multiple scenario spaces related to learning topics.