这些访问码的价格通常在每门课程80美元到155美元之间不等，学生需要通过这些访问码才能在线使用麦格劳·希尔和培生等教育公司开发的系统。
The codes—which typically range in price from $80 to $155 per course—give students online access to systems developed by education companies like McGraw Hill and Pearson.
控制着21%高等教育市场的麦格劳·希尔在3月里的报告称，其数字内容销售额在2015年首次超过了纸质。
McGraw Hill, which controls 21% of the higher education market, reported in March that its digital content sales exceeded print sales for the first time in 2015.
麦格劳·希尔没有回应记者的置评请求，但其首席执行官戴维·莱文在8月份告诉英国《金融时报》：“在高等教育领域，纸质版教科书的时代已经结束。”
McGraw Hill didn't respond to a request for comment, but its CEO David Levin told the Financial Times in August that "in higher education, the era of the printed textbook is now over.
麦格劳·希尔公司没有对评论的请求给出回应，但其首席执行官戴维·莱文在8月份告诉《金融时报》：“在高等教育领域，印刷教材的时代已经结束。”
McGraw Hill didn't respond to a request for comment, but its CEO David Levin told the Financial Times in August that "in higher education, the era of the printed textbook is now over."
麦格劳·希尔公司没有对评论的请求给出回应，但其首席执行官戴维·莱文在8月份告诉《金融时报》：“在高等教育领域，印刷教材的时代已经结束。”
McGraw Hill didn't respond to a request for comment, but its CEO David Levin told the Financial Times in August that "in higher education, the era of the printed textbook is now over."
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