Lecture notes are available only for those lectures requiring visual or textual materials beyond what is contained in the online textbook.
课堂补充资料只有在课程所需的图片或文字资料超出线上参考书所含内容时才提供。
The textbook industry insists the online systems represent a better deal for students.
教科书行业坚称，在线系统对学生来说是更好的选择。
You can also check textbook exchanges at your school. These are available on student boards, and some exchanges can even be found online.
你可以在学校里交换你的课本用。
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