由于这些讨论几乎不可避免地涉及到价格、专利、知识产权保护和竞争等问题，这就更加突出了。
This is all the more so since these discussions almost inevitably turn to questions of prices, patents, intellectual property protection, and competition.
书籍能提供非常丰富的知识，而且价格比上一门课要便宜得多。
Books offer an outstanding wealth of learning at a much cheaper price than taking a course.
通过高速网络和智能手机，任何人通过身份核验后都可以成为一名线上教师，并且任何拥有线上账户的人都可以以实惠的价格购买自己需要的“知识付费”产品。
With a fast network and a smartphone, anyone who has passed the identity (身份) check can be an online teacher, and anyone with an online account can buy "pay for knowledge" products that he or she wants at an affordable price.
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