So this just - just saying a little bit more about the sections, there's three sections, we have online discussion section sign up, has anybody tried to do that yet?

这只是对组会做更多一些的介绍,有三种组会,我们有在线讨论组会,有人曾经尝试过这个么

耶鲁公开课 - 生物医学工程探索课程节选