正文可以从4点变到108点，但印刷质量丝毫不会降低。
Text can be scaled from 4 points to 108 points without any loss of quality.
它能帮助学生理解，而印刷出来的作业任务是无法做到这一点的。
It helps students understand in a way that you can't do with print homework assignments.
如果印刷纸质书不花钱——这一点我不相信，那么纸质书与电子书应该是一样的价格。
If it costs them nothing to print the paper book, which I can't believe, then they should be the same price.
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