translation.en: And in fact, these free courses could not only be available just on the Internet, but you could make it so that DVDs were always available, and so anybody who has access to a DVD player can have the very best teachers.
translation.zh: 事实上，这些免费的课程资料不仅可以在互联网上传播 还可以制成DVD光盘 人们只需要买一台DVD机就可以拥有最好的老师了