and also there are previous exams and answers keys.

也有以前的考试题和解答
All these things are on the course website

这些都在课程网站上
so you'll get help there.

你们可以从那里得到帮助
But one thing that's really special is the course Wiki.

有一点特别的是维基课程
This is the third year we've done it

今年是这个体系被完成的第三个年头
and the second year in a really systematic way.

也是第二年系统地使用这个体系
So you get assigned to do, to cover a couple frames of the PowerPoint.

你们的作业就是负责制作几张幻灯片
So those are the ones you really need to take careful notes on,

你们必须认真撰写幻灯片的内容
and write them up, and help other people too;

并把它们写上网站以帮助其他人
that's the nature of a Wiki, as you know.

这正是维基百科的本质
How many of you have participated in a Wiki?

你们有多少人参与过维基百科编辑
Well, by next week it will be all of you.

嗯下周你们就都会有参与经验了