circular disc

例句：

1. 1.The machine has a circular disc that spins the drum.
   这台机器有一个圆形的盘，它旋转着鼓。
2. 2.The scientist used a circular disc to measure the distance between two points.
   科学家使用一个圆形的盘来测量两点之间的距离。
3. 3. The circular disc was the only thing in sight.
   圆形的盘是眼前唯一的物体。