在余先生最近做的一场演讲中，他展示了一些关于经济的图表和照片。
As part of a lecture he recently gave, Yu included some photographs among the usual economic charts and graphs.
利用照片、图表和图示仅仅是为了说明演讲中的关键点。
Use photos, charts and diagrams only to illustrate key points of your presentation.
它可以让演讲者迅速罗列出演讲要点，制作出显示图片与图表的幻灯片。
It quickly allows one to compose speaking notes and to create slides showing images and graphs.
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