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.

这些密码的价格通常在每门课程80美元到155美元之间，学生需要通过这些密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。