幻灯片放映机

例句：

1. 1. The teacher used a slideshow to explain the concept of gravity.
   老师使用幻灯片来讲解重力的概念。
2. 2. She presented her research on climate change at the conference.
   她在会议上展示了关于气候变化的研究。
3. 3. The slideshow was so engaging that everyone in the audience was captivated.
   幻灯片演示非常吸引人，全场观众都被吸引住了。