Admittedly, under the era of technology-based society, the polarization of online courses has been replaced the position of traditional way of teaching gradually. For instance, if there was no online education application, the the practice of distance education in many under-developed areas would not be applied under the outbreak of Covid-19. Moreover, the mutual exchanges of information online could be recorded and recycled, in which the immeasurable costs of tutorship compared with offline courses would be reduced. Therefore, the alternative learning environment for personalized learning ensured students reinforced and improved their memory on knowledge.