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.
星图，图表和时间表作为宝贵的资源，而生动的彩色照片说明的概念，并把天空的魅力呈现给生命。
Star maps, charts, and timetables serve as valuable resources, while vivid color photos illustrate concepts and bring the sky to life.
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