You've probably already noticed that there's some material that's set aside from the text in boxes, and I encourage you to particularly look at those boxes for this chapter.

你们可能已经注意到,在正文旁边的方框里有一些材料,我希望你们仔细看看方框中的内容

耶鲁公开课 - 生物医学工程探索课程节选