Through sharing quality resources across time and space, online teaching and learning can reduce the costs and improve the social benefits, especially in founding a knowledge society of life-long learning and general learning, and in accomplishing higher education in a popular style. 在网上教学中,通过跨时空的优质资源的共享,能够降低成本,提高社会效益,它特别有助于创建终身教育和全民学习的知识型社会,实现高等教育大众化。