smart teaching board. A certain "whitewashing phenomenon". That is, what the researcher observes may be a certain degree of truth. For teachers , the outsiders who enter the classroom are usually leaders, teachers, or others authorized by the leadership . Their arrival means some observation, analysis, and evaluation of classroom activities. The researcher is also allowed to enter the classroom through the leadership of the school , so the identity of the researcher is not only the role of the researcher in their view , although I have repeatedly stated that I will fulfill the ethics that a researcher should abide by , but I The possibility of school leaders?? contact still makes the researchers become potential teachers??. The IQAio GR519 is an upgraded lightweight version based on the original IQAio GR511. The original dual-cavity structure was changed to a bottom-edge structure, so that the minimalist design accommodates modern classrooms and conference rooms. With one IQProjector V2 and one IQView E3821, you can achieve flexible and intelligent classroom.