electromagnetic velocity metre

例句：

1. 1. This device measures the speed of light in a vacuum.
   这个装置测量真空中光速的速度。
2. 2. The scientist used an electromagnetic velocity meter to measure the distance between two points.
   科学家使用一个电磁速度计来测量两点之间的距离。
3. 3. The new model of the electromagnetic velocity meter is more accurate than its predecessors.
   新型的电磁速度计比它的前身更准确。