He says that and then he shows an even more detailed picture, but what I want to show you on this slide is just the simple part of it.

他虽这么说却居然,拿出了一张甚至更复杂的图片,但我只想告诉你们,这张幻灯片上很简单的一部分

耶鲁公开课 - 生物医学工程探索课程节选