https://online2.tingclass.net/lesson/shi0529/0008/8462/2.mp3
https://image.tingclass.net/statics/js/2012
Signposting is informing listeners about what is to be presented in a presentation, and constantly informing listeners as to where they are during that presentation.
指示是告诉听众展示中将要说的内容,并不断告诉听众展示的进度。