a slide projector

• 幻灯机

a slide projector的用法和样例：

例句

1. There is a new projector in my office.
   我的办公室里有一架新的幻灯机。
2. The lecture was going well until the projector broke down and put the professor off his stride.
   在幻灯机坏掉并打乱了教授的进度前，讲座一直进行得很顺利。