求翻译：案例教学与课程讲授教学不同，往往需要花较多的时间进行课前准备。在使用讲授教学法的课程中，学生即使课前不作任何准备，仍能通过注意听课从课堂教学中获益，而这种做法在使用案例教学法的课程中则不再有效。对于案例分析讨论课，适当的课前准备不可或缺。为此，每个学生都应从以下两个方面出发，做好案例讨论的课前准备工作：是什么意思？

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