ray projector

例句：

1. 1. This ray projector is very powerful and easy to use.
   这款射线投影仪非常强大且易于使用。
2. 2.The teacher used the ray projector to show us how to draw a circle.
   老师用射线投影仪向我们展示了如何画一个圆。
3. 3. The ray projector was perfect for our presentation because it could display large images clearly.
   射线投影仪非常适合我们的演示，因为它可以清晰地显示大型图像。