Well the power points will be available before, say for this lecture it will be before so that you can use them in class.

幻灯片其实课前就能下载，这样你上课时就能用到。

哈佛公开课 - 幸福课课程节选

And also because, and this is also the reason why the power points are always available, I want you to be engaged in the material.

另一个原因，之所以提前提供幻灯片，我希望你们能充分理解材料。

哈佛公开课 - 幸福课课程节选